2 Answers

Austen Holmes · Answer 1 · 2021-02-24T14:49:09+0000

Answer:

x=42°

Explanation:

In any triangle, when all three angles are added together, their sum will always be 180°:

∠1+∠2+∠3=180

Insert any known values:

29+109+x=180

Simplify the addition:

138+x=180

Use inverse operations to find angle three. Subtract 138 from both sides:

$138-138+x=180-138\\\\x=42$

Therefore, the unknown angle is 42°.

:Done

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