Identify the nets which can be used to make cubes
cos 2pi/15×cos 4pi/15×cos 8pi/15×cos 14pi/15=1/16
Find the mean of 994,996,998,1002 and 1000
PQRS is a square and T and U are respectively, the mid-points of PS and QR. Find the area of Δ OTS if PQ=8 cm