The radius of a circle is increased by 3 in., which increases the area by 100 in. Find the radius of the original circle. Round
to the nearest hundredth.
1 answer:
Answer:
3.81 inches
Step-by-step explanation:
πr² + 100 = π(r+3)²
divide by π and simplify:
r² + (100/π) = r² + 6r + 9
100/π = r² + 6r + 9
31.8309886184 - 9 = r² +6r
r² = 6r - 22.8309886184
0 = 6r - 22.8309886184
22.8309886184 = 6r
divide by 6:
3.80516476973 ≈ 3.81 inches
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Choice D
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Step-by-step explanation:
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