Question

a play top in a form of a hemispha plate of is in the form of hemisphere surmounted on a cone the diameter of a sphere is 3.6 the total length of the plate of is 4.2 find its total surface area

Answer 1

TSA=2πr^2+πrl . (l=√1.8^2+2.4^2=√3.24+5.76=√9.00=3, h =4.2-1.8=2.4, r=1.8)
TSA=π r(2r+l)
=22/7×1.8(2×1.8+3)
3.14×1.8×6.6=37.30 unit^2.