Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
Theorem 24
|
The sum of the angles of a quadrilateral is 360 degrees.
|
|
|
Corollary: Theorem 24
|
A quadrilateral is equiangular iff it is a rectangle.
|
|
|
Theorem 25
|
The opposite sides and angles of a parallelogram bisect each other.
|
|
|
Theorem 26
|
The diagonals of a parallelogram bisect each other.
|
|
|
Theorem 27
|
A quadrilateral is a parallelogram if its opposite sides are equal.
|
|
|
Theorem 28
|
A quadrilateral is a parallelogram if its opposite angles are equal
|
|
|
Theorem 29
|
A quadrilateral is a parallelogram if two opposite sides are both parallel and equal.
|
|
|
Theorem 30
|
A quadrilateral is a parallelogram if its diagonals bisect each other.
|
|
|
Theorem 31
|
All rectangles are parallelograms.
|
|
|
Theorem 32
|
All rhombuses are parallelograms.
|
|
|
Theorem 33
|
The diagonals of a rectangle are equal.
|
|
|
Theorem 34
|
The diagonals of a rhombus are equal.
|
|
|
Theorem 35
|
The base angles of an isosceles trapezoid are equal.
|
|
|
Theorem 36
|
The base diagonals of an isosceles trapezoid are equal.
|
|
|
Theorem 37: The Midsegment Theorem
|
A midsegment of a triangle is parallel to the third side and half as long.
|
|
|
Convex and concave polygons
|
A polygon is convex if, for each pair of points inside a polygon, the line segment connecting them lies entirely inside the polygon. A polygon is concave if, for a pair of points inside the polygon, the line segment connecting them does not lie entirely inside the polygon.
|
|
|
Diagonal
|
A diagonal of a polygon is a line segment that connects any two nonconsecutive vertices.
|
|
|
Parallelogram
|
A parallelogram is a quadrilateral whose opposite sides are parallel.
|
|
|
Point symmetry
|
Two points are symmetric with respect to a point iff it is the midpoint of the line segment joining them.
|
|
|
Rectangle
|
A rectangle is a quadrilateral each of whose angles is a right angle.
|
|
|
Rhombus
|
A rhombus is a quadrilateral all of whose sides are equal.
|
|
|
Square
|
A square is a quadrilateral all of whose sides and angles are equal.
|
|
|
Trapezoid
|
A trapezoid is a quadrilateral that has exactly one pair of parallel sides.
|
