## Realated Questions

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?