A corn cob, shaped somewhat like a cone, has the radius of it'd broadest end as 2.1cm and length as 20cm. If each 1cm sq. of the surface of the cob carries an average of four grains, find how many grains you would find on the entire cob?

In the figure (not to scale) AB = CD, angle DAP = angle DPA and A,B,C,D are concycli. If angle ADC = 80°, then find angle ACD.

Solve : 2^(x+2)+2^(x-1)=9

Volume of a Cylinder

What length of tarpaulin 3m wide will be required to make conical tent of height 8m and base radius 6m ? Assume that the extra length of material that will be required for stitching and wastage in cutting is approximately 20cm ( Use pi= 3.14)

Find the square of: 2a +b