Answer:
ac
Step-by-step explanation:
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What? I don't understand.
Answer:
Step-by-step explanation:
The length around the circle is called the circumference, the length aross the circle is the diameter and half of that is called the radius.
The Pythagorean theorem tells you
... a² + b² = c²
so
... a² = c² - b² = 16² - 9² = 256-81 = 175
... a = √175 = √(25·7)
... a = 5√7
