Question

Two of the angles in a triangle measure 31° and 10° what is the measure of the third angle

Answer 1

139°

Step-by-step explanation:

Let the measure of the third angle = x

The sum of the measures of angles in a triangle is 180 degrees.

Thus:

`31\degree+10\degree+x=180\degree`

We solve the equation for x:

`\begin{gathered} 41\degree+x=180\degree \\ x=180\degree-41\degree \\ x=139\degree \end{gathered}`

The measure of the third angle is 139°.