GEOMETRY - Triangle Similarity Warm-Up

Tell whether the triangles are similar or not.

• a

• b

Are these two triangles similar? Which similarity criterion do you use to prove it?

• Yes, SSS

• Not Similar

• Yes, SAS

• Yes, AA

Find the value of x using proportions.

• a

• b

• c

• d

Are these two triangles similar? Which similarity criterion do you use to prove it?

• Yes, SSS

• Yes, SAS

• Yes, AA

• Not similar.

Are these two triangles similar? Which similarity criterion do you use to prove it?

• Yes, SSS

• Yes, AA

• Yes, SAS

• Not similar

What does it mean for two shapes to be similar?

• Their angles add up to 180^o.

• They are congruent.

• Same shape, but different size.

• Same size and same shape.

Find side length X.

• 30
• 25
• 15
• 40