





A solid is shown in the figure below. The vertices ABCDEFGH form a 4 cm x 2 cm x 2 cm cuboid. The segments AI and DI are both of length 5 cm, and points I, C, G, F, B are coplanar. What is the height (in cm) of point I from the base rectangle EFGH? 
The figure shows the front view of a convex lens, which originally had only one edge. Five holes of different shapes, namely triangle, square, pentagon, hexagon and circle, were drilled through it...What is the total number of edges in the lens after the holes were drilled? 





