Similarity & Right Triangles Vocab

Front

Figures with the same shape but not necessarily the same size; corresponding angles are equal, and corresponding sides are proportional.

Back

similar figures

Front

The equality of two ratios or fractions.

Back

proportionality

Front

If two angles of one triangle are congruent to two angles of another triangle, the triangles are similar.

Back

AA (Angle-Angle) Criterion for similarity

Front

If an angle of one triangle is congruent to an angle of another triangle and the sides including these angles are in proportion, the triangles are similar.

Back

SAS (Side-Angle-Side) Similarity criterion

Front

If the corresponding sides of two triangles are in proportion, the triangles are similar.

Back

SSS (Side-Side-Side) Similarity criterion

Front

Ratios of the lengths of sides in a right triangle (sine, cosine, tangent).

Back

trigonometric ratios

Front

The ratio of the length of the side opposite an angle to the length of the hypotenuse.

Back

sine (sin)

Front

The ratio of the length of the adjacent side to the length of the hypotenuse.

Back

cosine (cos)

Front

The ratio of the length of the side opposite an angle to the length of the adjacent side.

Back

tangent (tan)

Front

In a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides.

Back

Pythagorean Theorem