Consider a right circular cone of base radius 4 cm and height 10 cm. A cylinder is to be placed inside the cone with one of the flat surface resting on the base of the cone. Find the largest possible total surface area (in sq. cm) of the cylinder.
Correct Answer : A
Ten straight lines, no two of which are parallel and no three of which pass through any common point, are drawn on a plane. The total number of regions (including finite and infinite regions) into which the plane would be divided by the lines is :
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?