the side of the square is incresing at the rate of 0.5cm/sec. find the rate of increase of its area when the side of the square is 20 cm long.
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Step-by-step explanation:
area of square= l^2 l is length
we have dl/dt=0.5
we have to find da/dt at l=20cm
where a is area
a=l^2
da/dt=2ldl/dt
da/dt=2×20×0.5
da/dt=20cm^2/sec
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