A circle with radius 5cm has its radius increasing at the...
A circle with radius 5cm has its radius increasing at the rate of 0.2m/s. What will be the corresponding increase in the area?
2π
5π
π
4π
Correct answer is A
Area of the circle (A) = πr2
dAdr=2πr
dAdt=dAdr.drdt
dAdt=2π×5×0.2=2π
A box contains 12 identical balls of which 5 are red, 4 blue, and the rest are green. If ...
In the diagram, PO and OR are radii, |PQ| = |QR| and reflex < PQR is 240o. Calculate the value x...
In the diagram below, O is the center of the circle if ∠QOR = 290o, find the size ∠QPR ...
Solve the following equation equation for x2+2xr2+1r4 = 0...
Find the positive number n, such that thrice its square is equal to twelve times the number ...
Solve for x in 8x-2 = 2/25 ...
In a geometric progression, the first term is 153 and the sixth term is 1727. The sum o...