All About Triangles

The triangles shown are similar. Which side corresponds with side BC?

• AB

• DE

• EF

• CA

The triangles shown are similar. Which angle corresponds to angle D?

•  $\angle$  A

•  $\angle$  B

•  $\angle$  C

•  $\angle$  E

The triangles shown are similar. What is the scale factor from ABC to DEF?

• 2

• 3

• 4

• 5

The triangles shown are similar. Find the length of side EF.

• 3

• 12

• 15

• 18

All the angles in a triangle

add up to ....

• 90 degrees

• 180 degrees

• 360 degrees

• It depends on the triangle

Find the missing angle in the triangle.

• $81^o$

• $91^o$

• $99^o$

• $101^o$

Can angles measuring 78^o, 30^o, and 82^o make a triangle?

• Yes

• No

If two side lengths of a triangle are 30 cm and 50 cm, what is a possible length of the third side?

• 70 cm

• 80 cm

• 100 cm

Find the measure of angle x.

• 125^o

• 45^o

• 60^o

• 35^o

A triangle with all 3 angles measuring less than 90^o is called a(n) ...

• Acute Triangle

• Right Triangle

• Obtuse Triangle