book Maths Puzzle Numerical Ability

the sum of 13 and twice a number

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book Other Question

A round barbecue pit is 2 meters in diameter. What is the distance around the barbecue pit?
a- 6.28 meters
b- 3.14 meters
c- 12.56 meters
d- 18.84 meters prove the following identity:

cos2A = 2cos^2A - 1