1 Answer

Timofey Drozhzhin · Answer 1 · 2019-04-01T09:05:31+0000

All the measures in a triangle are equal to 180 degrees.

Let the unknown angle= x.

40+89+x= 180

Combine like terms.

129+x= 180

Subtract 129 from both sides.

x= 51

The angle is equal to 51.

I hope this helps!
~kaikers

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