In the figure given alongside, diameter AB of the circle is 15 cms. The length of chord AC is 12cm and the length of chord BD is 9 cm. The area of figure ACBD in square cm is
Correct Answer : A
4 identical circular coins are placed inside the square ABCD as in the following diagram. If for each coin then the area not occupied by the coins in ABCD is
Three circles with centers P, Q and R, each with radius 20 cms, interest one another as shown in the figure. The length of AB=12 cms, CD=10 cms and EF=5cms. What is the perimeter of the triangle PQR?
Let C be a circle with centre P0and AB be a diameter of C. Suppose P1is the mid point of the line segment P0B, P2is the mid point of the line segment P1B and so on. Let C1, C2, C3, ...... be circles with diameters P0P1, P1P2, P2P3... respectively. Suppose the circles C1,C2, C3, .... are all shaded. The ratio of the area of the unshaded portion of C to that of the original circle C is?