# 1.find the area of circle whose circumference is 44cm? 2.log(a+b)+log(a-b)-log(a2-b2) 3.The perimeter of a square circumscribing a circle of radius a units is

1
by safura

2015-01-11T23:05:40+05:30

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Radius of circle  = R cm

2 π R = circumference =  44
2 * 22 / 7 * R = 44 cm
R = 7 cm

Area  = π R² = 22/7 * 7² = 154 cm²
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Log x + Log y = Log x * y
Log x - Log y = Log x/y

Log (a+b) + Log (a-b) - Log (a² - b²)
= Log (a+b)(a-b)/(a²-b²) = Log 1 = 0
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square circumscribes a circle of radius a units.
The line segment joining centers of opposite sides is the diameter of the circle.
So side of square = diameter of circle = 2 a
perimeter = 4 * 2 a = 8 a  units