Question

IF the total surface of the cylinder of radius 7cm is 880 cm2 then its height is -------------

Answer 1

r=7cm. tsa=880 cm2 Therefore 2pi r(h+r)= 880 2*22/7*7 ( h + 7)= 880 h+7= 880 * 7/2*22*7 h+7=20 h=20-7=13cm

Answer 2

2*pie*radius(height+radius)=TSA of cylinder
2*22/7*7(height+7)=880
44(height+7)=880
height+7=880/44
height+7=20
height=20-7
height=13