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How do I figure this out
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How do I figure this out

How do I figure this out-example-1
User TommyG
by
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1 Answer

3 votes
3 votes

Answer:

  • x = 21

Explanation:

Given triangle is equilateral since all three angles marked as congruent.

It means each interior angle measures 60°.

The angle (5x + 15)° is exterior angle.

We know exterior angle measure is same as the sum of non-adjacent interior angles:

  • 5x + 15 = 60 + 60
  • 5x + 15 = 120
  • 5x = 120 - 15
  • 5x = 105
  • x = 105/5
  • x = 21
User Lincetto
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2.7k points
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