Answer:
x = 15
Step-by-step explanation:
20^2 + x^2 = 25^2
400 + x^2 = 625
subtract each side 400
it results to 225
square root 225, to equals this -->
X = 15
15
circumference=2\pi r
25.12cm
hope this helps
Answer: 7 and a half hours
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