Question

A triangle has one angle that measures 30 degrees and one that measures 100. What's the measure for the third angle?​

Answer 1

50 degrees

Explanation:

All the angles in a triangle must add up to 180 degrees

a+b+c=180

Substitute 30 in for a, and 100 in for b

30+100+c=180

Combine like terms

130+ c=180

Subtract 130 on both sides

c=50

So, the third angle is 50 degrees

Hope this helps! :)

Answer 2

Explanation:

Sum of the interior angles of the triangle =180°

Let the third angle be x°

Therefore, x°+30°+100°=180°

x = 180°-130°= 50°