12-2 G: Similar Triangles Reteach (Unit 4B)

Front

What does AA~ stand for in triangle similarity?

Back

AA~ stands for Angle-Angle similarity, which states that if two angles of one triangle are equal to two angles of another triangle, the triangles are similar.

Front

What does SSS~ stand for in triangle similarity?

Back

SSS~ stands for Side-Side-Side similarity, which states that if the corresponding sides of two triangles are in proportion, the triangles are similar.

Front

What does SAS~ stand for in triangle similarity?

Back

SAS~ stands for Side-Angle-Side similarity, which states that if two sides of one triangle are in proportion to two sides of another triangle and the included angles are equal, the triangles are similar.

Front

What is the scale factor in similar triangles?

Back

The scale factor is the ratio of the lengths of corresponding sides of two similar triangles.

Front

If ΔGHJ ∼ΔLMK with a scale factor of 5:6, what does this mean?

Back

It means that for every 5 units in triangle GHJ, there are 6 corresponding units in triangle LMK.

Front

How do you determine if two triangles are similar?

Back

You can determine if two triangles are similar by checking for AA~, SSS~, or SAS criteria.

Front

What is the perimeter of a triangle?

Back

The perimeter of a triangle is the sum of the lengths of all its sides.

Front

If the perimeter of ΔLMK is 42, what is the perimeter of ΔGHJ if they are similar with a scale factor of 5:6?

Back

The perimeter of ΔGHJ is 35.

Front

What does it mean if two triangles are 'not similar'?

Back

It means that the triangles do not meet any of the similarity criteria (AA~, SSS~, SAS) and their corresponding angles and sides are not proportional.

Front

How do you find the value of x in similar triangles?

Back

You can find the value of x by setting up a proportion based on the corresponding sides of the similar triangles.