Geometry Terms

Front 1

I am the side opposite the right angle in a right triangle

Back 1

I am the hypotenuse of a right triangle.

Front 2

What am I?"

Back 2

I am the hypotenuse of a right triangle.

Front 3

I am a triangle with three equal (congruent) sides and three equal (congruent) angles

Back 3

I am an equilateral triangle.

Front 4

What am I?"

Back 4

I am an equilateral triangle.

Front 5

I am the point of intersection of the three axes of a triangle

Back 5

I am the circumcenter of a triangle.

Front 6

What am I?"

Back 6

I am the circumcenter of a triangle.

Front 7

I am any one side of the triangle. Usually I am the side the triangle is resting upon.

Back 7

I am the base of the triangle.

Front 8

What am I?"

Back 8

I am the base of the triangle.

Front 9

I am the point of intersection of the three altitudes of a triangle

Back 9

I am the orthocenter of a triangle.

Front 10

What am I?"

Back 10

I am the orthocenter of a triangle.

Front 11

I am a perpendicular line drawn through the midpoint of a side.

Back 11

I am the axis of a triangle.

Front 12

What am I?"

Back 12

I am the axis of a triangle.

Front 13

I am a triangle in which the two equal sides form a right angle.

Back 13

I am an isosceles right-angled triangle.

Front 14

What am I?"

Back 14

I am an isosceles right-angled triangle.

Front 15

I am formed by two sides drawn from a common endpoint. A triangle has three of me.

Back 15

I am the angle of the triangle.

Front 16

What am I?"

Back 16

I am the angle of the triangle.

Front 17

I am the point of intersection of the three bisectors of a triangle.

Back 17

I am the incenter of a triangle.

Front 18

What am I?"

Back 18

I am the incenter of a triangle.

Front 19

I am the plane limited by the sides of the triangle.

Back 19

I am the area of the triangle.

Front 20

What am I?"

Back 20

I am the area of the triangle.

Front 21

We are the sides of a right triangle that form the right angle.

Back 21

We are the legs of a right triangle.

Front 22

What are we?"

Back 22

We are the legs of a right triangle.

Front 23

I am the line drawn from any one vertex of a triangle to the midpoint of the opposite side.

Back 23

I am the median of a triangle.

Front 24

What am I?"

Back 24

I am the median of a triangle.

Front 25

I am the point at which the medians intersect.

Back 25

I am the centroid of a triangle.

Front 26

Wht am I?"

Back 26

I am the centroid of a triangle.

Front 27

I am a triangle that has three angles that measures between zero degree and 90 degrees.

Back 27

I am an acute triangle.

Front 28

What am I?"

Back 28

I am an acute triangle.

Front 29

I am a triangle with no equal sides and a right angle.

Back 29

I am a scalene right-angled triangle.

Front 30

What am I?"

Back 30

I am a scalene right-angled triangle.

Front 31

I am a triangle with no equal sides and an obtuse angle

Back 31

I am a scalene obtuse-angled triangle.

Front 32

What am I?"

Back 32

I am a scalene obtuse-angled triangle.

Front 33

I am a triangle with no equal sides and all acute angles

Back 33

I am a scalene acute-angled triangle.

Front 34

What am I?"

Back 34

I am a scalene acute-angled triangle.

Front 35

I am the distance around the triangle.

Back 35

I am the perimeter of a triangle.

Front 36

What am I?"

Back 36

I am the perimeter of a triangle.

Front 37

I am a triangle with two equal (congruent) sides.

Back 37

I am an isosceles triangle.

Front 38

What am I?"

Back 38

I am an isosceles triangle.

Front 39

I am a triangle with two equal sides and all acute angles.

Back 39

I am an isosceles acute-angled triangle.

Front 40

What am I?"

Back 40

I am an isosceles acute-angled triangle.

Front 41

We are the line segments that form the triangle.

Back 41

We are the sides of the triangle.

Front 42

What are we?"

Back 42

We are the sides of the triangle.

Front 43

I am a triangle that has one angle that measures exactly 90 degrees

Back 43

I am a right triangle.

Front 44

What am I?"

Back 44

I am a right triangle.

Front 45

I am a triangle with no equal (congruent) sides.

Back 45

I am a scalene triangle.

Front 46

What am I?"

Back 46

I am a scalene triangle.

Front 47

I am the common endpoint of two sides. A triangle has three of me

Back 47

I am the vertex of a triangle. When there are more than one of me, we are called vertices.

Front 48

What am I?"

Back 48

I am the vertex of a triangle. When there are more than one of me, we are called vertices.

Front 49

I am a triangle that has one angle that measures between 90 degrees and 180 degrees.

Back 49

I am an obtuse triangle.

Front 50

What am I?"

Back 50

I am an obtuse triangle.

Front 51

I am the line from any one vertex drawn perpendicular to the opposite side, extended if necessary.

Back 51

I am the altitude of a triangle.

Front 52

What am I?"

Back 52

I am the altitude of a triangle.

Front 53

I am a triangle in which the two equal sides form an obtuse angle.

Back 53

I am an isosceles obtused-angled triangle.

Front 54

What am I?"

Back 54

I am an isosceles obtused-angled triangle.

Front 55

Area of Square

Back 55

L x W

Front 56

Area of Rectangle

Back 56

L x W

Front 57

Area of Triangle

Back 57

1/2 B x H

Front 58

Area of Circle

Back 58

Pi x Radius Squared

Front 59

Area of Paralellogram

Back 59

B x H

Front 60

Perimeter of Square

Back 60

S x 4

Front 61

Perimeter of Rectangle

Back 61

L x 2 + W x 2

Front 62

Circumference

Back 62

Pi x Diameter

Front 63

Perimeter of Triangle

Back 63

S + S + S

Front 64

What are parallel lines?

Back 64

Lines that are coplanar and don't intersect.

Front 65

What are perpendicular lines?

Back 65

Lines that intersect at 90 degree angles.

Front 66

What are skew lines?

Back 66

Lines that are not coplanar, not parallel, and do not intersect.

Front 67

What are parallel planes?

Back 67

Planes that don't intersect.

Front 68

What is a transversal?

Back 68

A line that intersects two coplanar lines at two different points.

Front 69

What are corresponding angles?

Back 69

Angles that lie on the same side of the transversal and on the same side of lines.

Front 70

What are alternate interior angles?

Back 70

Angles that are non-adjacent that lie on opposite sides of the transversal between lines.

Front 71

What are alternate exterior angles?

Back 71

Angles that lie on opposite sides of the transversal outside lines.

Front 72

What are same-side interior angles?

Back 72

Angles that lie on the same side of the transversal between lines.

Front 73

What is a line?

Back 73

A straight path with no thickness that extends forever.

Front 74

Area of Square

Back 74

L x W

Front 75

Area of Rectangle

Back 75

L x W

Front 76

Area of Triangle

Back 76

1/2 B x H

Front 77

Area of Circle

Back 77

Pi x Radius Squared

Front 78

Area of Paralellogram

Back 78

B x H

Front 79

Perimeter of Square

Back 79

S x 4

Front 80

Perimeter of Rectangle

Back 80

L x 2 + W x 2

Front 81

Circumference

Back 81

Pi x Diameter

Front 82

Perimeter of Triangle

Back 82

S + S + S

Front 83

What are parallel lines?

Back 83

Lines that are coplanar and don't intersect.

Front 84

What are perpendicular lines?

Back 84

Lines that intersect at 90 degree angles.

Front 85

What are skew lines?

Back 85

Lines that are not coplanar, not parallel, and do not intersect.

Front 86

What are parallel planes?

Back 86

Planes that don't intersect.

Front 87

What is a transversal?

Back 87

A line that intersects two coplanar lines at two different points.

Front 88

What are corresponding angles?

Back 88

Angles that lie on the same side of the transversal and on the same side of lines.

Front 89

What are alternate interior angles?

Back 89

Angles that are non-adjacent that lie on opposite sides of the transversal between lines.

Front 90

What are alternate exterior angles?

Back 90

Angles that lie on opposite sides of the transversal outside lines.

Front 91

What are same-side interior angles?

Back 91

Angles that lie on the same side of the transversal between lines.

Front 92

What is a line?

Back 92

A straight path with no thickness that extends forever.