10. Find the circumference of two circle are in the ratio 4:5. Find the ratio of the
areas.
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Step-by-step explanation:
Ratio of circumference = 4 : 5
= 4 × 2πr : 5 × 2πr
= 4r : 5r
Ratio of areas of circles =
(4r)² : (5r)²
= 16r² : 25 r²
Hence their ratio of areas is = 16 : 25
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