Question
The circumference of the two circles is 110 cm and 330
cm respectively. What is the difference between their radii?Solution
2p (r1 – r2) = 330 – 110  = 220 ×7)/22×2 (r1 – r2) = 35 cm
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Bell metal is an alloy of–
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Who discovered the Rh factor in blood in the year 1940?
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