IXL | Find missing angles in triangles

The diagram shows a triangle.

42°

76°

What is the value of

ref_doc_title.

Learn with an example

The diagram shows a triangle.

44°

57°

What is the value of

The sum of the interior angle measures of a triangle is 180°.

First, look at the interior angle measures in the triangle.

Set the sum of the interior angle measures of the triangle equal to 180°. Solve for

44°

57°

180°

101°

Combine like terms

180°

Combine like terms

Subtract 101° from both sides

79°

Subtract 101° from both sides

So,

79°

Looking for more? Try these:

$Confetti$

Now entering the Challenge Zone—are you ready?

hr	min	sec
00	00	04

Teacher tools

Work it out

Not feeling ready yet? These can help: