Isosceles Triangle Exterior Angle Lesson

​7.1 and 7.2 Interior and Exterior Angles and Isosc. & Equilateral Triangles

" An investment in knowledge pays the best interest."

​

-Benjamin Franklin

Multiple Choice

If two sides of a triangle are congruent, then the _________________ opposite those sides are congruent. NOT ON THE PACKET!!!

• sides

• vertices

• angles

• measures

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Multiple Choice

What is the measure of ∠S? HINT!!! THIS IS AN ISOSCELES TRIANGLE. USE TRIANGLE SUM THEOREM angle T + angle R + angle S =180 DEGREES. #2

• 60⁰

• 52⁰

• 45⁰

• 36⁰

Multiple Choice

Find the value of x. THIS IS AN ISOSCELES TRIANGLE (BASE ANGLES ARE CONGRUENT).

USE TRIANGLE SUM THEOREM TO SOLVE FOR X.

• x = 118

• x = 31

• x = 23

• x = 62

Fill in the Blanks

What is the value of x? **This is an Isosceles Triangle**

Angle P and Angle Q are base angles. Angle P = Angle Q. # 18

Remember to use the Triangle Sum Theorem: Angle P +Angle Q+ Angle R =180 degrees

Fill in the Blanks

Find the value of x. #24

Multiple Choice

If a triangle has all three angles equivalent and all three sides equivalent, what type of triangle is it?

• Acute Isosceles

• Equilateral

• Obtuse Scalene

• Obtuse Isosceles

Multiple Choice

What is the length of DF? #27

• 8

• 4

• 25

• 71

Multiple Choice

What is the measure of ∠S? #21

• not enough information

• 30

• 60

• 180

Fill in the Blanks

Find x.

HINT!!! THIS IS AN EQUILATERAL TRIANGLE. ALL ANGLES AND ALL SIDES ARE EQUAL. #12

Multiple Choice

Which of the following terms best describes Angle d? #11

• Remote interior angle

• Corresponding angle

• Exterior angle

• Interior angle

Multiple Choice

Find the measure of the indicated angle.

HINT!!! USE EXTERIOR ANGLE THEOREM ANGLE 1 INSIDE + ANGLE 2 INSIDE = EXTERIOR ANGLE OUTSIDE. #6

• 145

• 113

• 102

• 78

Multiple Choice

Find the measure of the indicated angle.

HINT!!! USE EXTERIOR ANGLE THEOREM ANGLE 1 INSIDE + ANGLE 2 INSIDE = EXTERIOR ANGLE OUTSIDE. #7

• 89

• 211

• 119

• 81

Multiple Choice

Find the value of x. #32

• A

• B

• C

• D

Multiple Choice

Find the measure of the exterior angle. #34

• 31^o

• 93^o

• 115^o

• 155^o