Similar Triangles

What does it mean for two shapes to be similar?

• Same shape, but different size.

• Same size and same shape.

• Their angles add up to 180^o.

• They are congruent.

Which is NOT true about similar triangles.

• The angles in the triangles are congruent to each other.

• The sides are proportional to each other.

• The angles in each triangle add up to 180^o.

• The triangles must have at least one side that is the same length.

Sides in similar figures must be proportional.  

• True

• False 

If two figures are similar, the corresponding sides are ______________.

• equal

• congruent

• proportional

• none of these

Matching sides are called

• Corresponding Sides

• Corresponding Angles

• The Same

• Congruent Sides

Matching angles are called

• Corresponding Sides

• Corresponding Angles

• The Same

• Congruent Angles

How long is side x?

• 2 ft

• 3 ft

• 4 ft

• 6 ft

How long is side x?

• 3

• 1.5

• 8

• 2/3

Find side length X.

• 30

• 25

• 15

• 40

What is the ratio of the side lengths?

• 1.25

• 1.5

• 2

• 2.5