Question

A right circular cylinder has diameter 14 cm and height 21 cm.find the total surface area of the cylinder.

Answer 1

Diameter=14 cm

Radius=14/2

Radius=7 cm

Height=21 cm

TSA of cylinder=2πr(r+h)

TSA=2π×7(7+21)

$2 \times \frac{22}{7} \times 7(7 + 21) \\ \\ 2 \times \frac{22}{\cancel 7} \times \: \cancel 7 \times 28$

=2×22×28

=1232 cm²

$\boxed{\mathbf{TSA={1232\:cm}^{2}}}$

Answer 2

Radius =7

Height=21

T. S. A=2πr(r+h)

=2×22/7×7(7+21)

=2×22×(28)

=1232 cm³