Similar Triangles

Front

What are similar triangles?

Back

Triangles that have the same shape but may differ in size. Their corresponding angles are equal, and their corresponding sides are in proportion.

Front

What does AA stand for in triangle similarity?

Back

Angle-Angle; if two angles of one triangle are equal to two angles of another triangle, the triangles are similar.

Front

What does SAS stand for in triangle similarity?

Back

Side-Angle-Side; 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 does SSS stand for in triangle similarity?

Back

Side-Side-Side; if the corresponding sides of two triangles are in proportion, the triangles are similar.

Front

How can you determine if two triangles are similar?

Back

By using the AA, SAS, or SSS criteria.

Front

If triangle ABC is similar to triangle DEF, what can be said about their angles?

Back

Angle A = Angle D, Angle B = Angle E, Angle C = Angle F.

Front

If the sides of triangle ABC are 3, 4, and 5, and the sides of triangle DEF are 6, 8, and 10, are the triangles similar?

Back

Yes, they are similar by SSS because the sides are in proportion (1:2).

Front

What is a scale factor in similar triangles?

Back

The ratio of the lengths of corresponding sides of two similar triangles.

Front

If triangle ABC is similar to triangle DEF with a scale factor of 3:1, what is the relationship between their areas?

Back

The area of triangle ABC is 9 times the area of triangle DEF.

Front

If AB/BC = 2/3, what is the value of AC if AB = 12?

Back

AC = 18, since the proportion can be used to find the corresponding side.