If the radius of a circle is decreased by 50%, find the percentage decrease in its area.
Let original radius = R.
New radius = =
Original area = and new area =
Decrease in area = = 75%
MS-Word is an example of _____
A man walked diagonally across a square lot. Approximately, what was the percent saved by not walking along the edges?
Let the side of the square(ABCD) be x meters.
Then, AB + BC = 2x metres.
AC = = (1.41x) m.
Saving on 2x metres = (0.59x) m.
Saving % = = 30% (approx)
If log 27 = 1.431, then the value of log 9 is
log 27 = 1.4313 log 3 = 1.431log 3 = 0.477log 9 = = 2 log 3 = (2 x 0.477) = 0.954
A sum of money lent at compound interest for 2 years at 20% per annum would fetch Rs.482 more, if the interest was payable half yearly than if it was payable annually . The sum is
C.I. when compounded half yearly =
C.I. when compounded annually =
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