3.5 Angles in Triangles

Presentation

•

Mathematics

•

9th - 12th Grade

•

Practice Problem

•

Medium

•

CCSS

8.G.A.5

Standards-aligned

Elizabeth Williams

Used 16+ times

FREE Resource

7 Slides • 6 Questions

3.5 Triangle Angle Sum

be sure to write down notes as you go

The interior angles in a triangle add up to 180 degrees.

Multiple Choice

The Triangle Angle Sum Theorem says that the interior angles in a triangle add up to _ degrees

360

180

270

Let me check your work when you finish.

Multiple Choice

Find the measure of the ? angle

112

180

Solve for x in the picture.

set up an equation
add the angles of the triangle together on one side
put 180 on the other side
solve your equation for x.
let me check your work when you are done.

Multiple Choice

Which equation would let you solve for x in the triangle?

6x+51=63

6x+51+63=180

6x+51+63=90

6x+63=51

Write the equation to solve for x in the picture.

Solve for x and let me check your answer when you are done.

An exterior angle is formed by extending any one side of a triangle.

Multiple Choice

According to the Exterior Angle Theorem, $m\angle1=$

$m\angle2-m\angle3$

180

$m\angle2+m\angle3$

Multiple Choice

Use the Exterior Angle Theorem to find the equation to solve for x.

x=86-63

x+63+86=180

x=63+86

x+63+86=90

Multiple Choice

Use the Exterior Angle Theorem to solve for x.

x=23

x=149

x=23

x=-59

All Done! You may now work on your practice!

3.5 Triangle Angle Sum

be sure to write down notes as you go

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3.5 Angles in Triangles

3.5 Triangle Angle Sum

​The interior angles in a triangle add up to 180 degrees.

​Let me check your work when you finish.

​Solve for x in the picture.

​Write the equation to solve for x in the picture.

​Solve for x and let me check your answer when you are done.

​An exterior angle is formed by extending any one side of a triangle.

​All Done! You may now work on your practice!

3.5 Triangle Angle Sum

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Mathematics

The interior angles in a triangle add up to 180 degrees.

Let me check your work when you finish.

Solve for x in the picture.

Write the equation to solve for x in the picture.

Solve for x and let me check your answer when you are done.

An exterior angle is formed by extending any one side of a triangle.

All Done! You may now work on your practice!