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Alex17521 [72]
3 years ago
15

What is the answer?​

Mathematics
1 answer:
olya-2409 [2.1K]3 years ago
6 0

Answer:

4

Step-by-step explanation:

a triangle has angles that add up to 180°

an equilateral triangle has equal angles

so each angle is 60° (because 180/3 is 60)

so 10x +20 = 60

10x = 40

x = 4

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