Question

Find the lateral surface area and total surface area of a cylinder with

height 28cm and radius 7cm.​

Answer 1

Step-by-step explanation:

Given radius of a cylinder (r) = 7 cm.

Height of a cylinder(h) = 28 cm.

$lateral \: surface \: area \: of \: cylinder = 2\pi \: rh \: \: sq.unit$

$= 2 \times \frac{22}{7} \times 7 \times 28 \: \: sq.cm$

$= 44 \times 28 \: \: sq.cm$

$= 1232 \: \: sq.cm$

$total \: surface \: area \: of \: cylinder = 2\pi \: r(h + r) \: \: sq.unit$

$= 2 \times \frac{22}{7} \times 7(28 + 7) \: \: sq.cm$

$= 44 \times 35 \: \: sq.cm$

$= 1540 \: \: sq.cm$

Answer 2

Step-by-step explanation:

Step-by-step explanation:

Given radius of a cylinder (r) = 7 cm.

Height of a cylinder(h) = 28 cm.

lateral \: surface \: area \: of \: cylinder = 2\pi \: rh \: \: sq.unitlateralsurfaceareaofcylinder=2πrhsq.unit

= 2 \times \frac{22}{7} \times 7 \times 28 \: \: sq.cm=2×

7

22

×7×28sq.cm

= 44 \times 28 \: \: sq.cm=44×28sq.cm

= 1232 \: \: sq.cm=1232sq.cm

total \: surface \: area \: of \: cylinder = 2\pi \: r(h + r) \: \: sq.unittotalsurfaceareaofcylinder=2πr(h+r)sq.unit

= 2 \times \frac{22}{7} \times 7(28 + 7) \: \: sq.cm=2×

7

22

×7(28+7)sq.cm

= 44 \times 35 \: \: sq.cm=44×35sq.cm

= 1540 \: \: sq.cm=1540sq.cm