CFA5 Triangles: Classifying & Angles

Fill in the blank: The sum of interior angles of a triangles is _________.

• 90

• 180

• congruent

• supplementary

Classify the triangle by angles and sides:

type like this: Angles name Sides name

In triangle ABC angle A=65, angle C=57. What is the measure of angle B?

• 50

• 122

• 58

• 180

Find x. (Show your work)

x = __

True or False: An exterior angle is the sum of adjacent interior angles.

• False; it is the sum of remote interior angles.

• False; it is the sum of congruent base angles.

• True

• False; it is the sum of all interior angles.

Find x. (Show your work)

x = __

Find the missing angle.

? = ___

Classify the triangle being described by angles and sides:

1 right angle & 2 congruent sides

• Equiangular Equilateral

• Obtuse Isosceles

• Right Scalene

• Right Isosceles

True or False: Equilateral triangles can only equiangular because all angles and sides are congruent.

• False; 2 angles and all sides are congruent.

• False; 2 angles and 2 sides are congruent

• True

• False; no angles or sides are congruent.

In triangle ABC angle A=47, angle C=67 and angle B=67. What is the measure of angle D if angle A and angle B are remote?

• 134

• 66

• 114

• 180