Geometry Congruent Triangles

Front 1

Corresponding angles-

Back 1

Same position in polygons with an equal number of sides.

Front 2

Corresponding sides-

Back 2

Same position in polygons with an equal number of sides.

Front 3

Congruent polygons-

Back 3

Two polygons if and only if their corresponding angles and sides are congruent.

Front 4

Triangle rigidity-

Back 4

Shortcut for proving two triangles congruent.

Front 5

Included angle-

Back 5

Angle formed by two adjacent sides of a polygon.

Front 6

Included side-

Back 6

Common side of two consecutive angles in a polygon.

Front 7

Coordinate proof-

Back 7

Style of proof that uses coordinate geometry and algebra.

Front 8

Legs-

Back 8

Congruent sides.

Front 9

Vertex angle-

Back 9

Angle formed by the legs.

Front 10

Base-

Back 10

Side opposite the vertex angle .

Front 11

Base angles-

Back 11

Two angles that have the base as a side.

Front 12

Acute triangle-

Back 12

Three acute angles.

Front 13

Equiangular Triangle-

Back 13

Three congruent acute angles.

Front 14

Equiangular Triangle-

Back 14

Three congruent acute angles.

Front 15

Right triangle-

Back 15

One right angle.

Front 16

Equiangular Triangle-

Back 16

Three congruent acute angles.

Front 17

Right triangle-

Back 17

One right angle.

Front 18

Obtuse triangle-

Back 18

One obtuse angle.

Front 19

Equilateral triangle-

Back 19

Three congruent sides.

Front 20

Equilateral triangle-

Back 20

Three congruent sides.

Front 21

Isosceles triangle-

Back 21

At least two congruent sides.

Front 22

Scalene triangle-

Back 22

No congruent sides.

Front 23

Auxiliary line-

Back 23

Line that is added to a figure to aid in a proof.