The six sides of a box were made of half centimeter thick wood. The outer dimensions of the box are 21 cms. long, 11 cms. broad and 6 cms. high. If the total amount paid for painting its inner surfaces was Rs. 70, price paid per square cm. of the painting was
Correct Answer : D
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?
The lines represented by the three equations
2X+3Y-5=0: 3X-5Y+2=0, and -5X+2Y+3=0
In the adjoining figure, chord ED is parallel to the diameter AC of the circle. If Angle CBE = 65 degree, then what is the value of DEC?