Question

Find the curved surface area and the total surface area of a cylinder whose dimension is
Radius of the base =21cm and height = 1 m​

Answer 1

Answer:

Step-by-step explanation:

csa=2(pi)rh=22/7 * 2*21*100=1200cm²

tsa=1200+2*22/7*21*21=1200+2772

=3972

Answer 2

Given :

Radius of the base of cylinder = 21 cm

Height of the cylinder = 1 m = 100 cm

To Find :

Curved Surface Area (CSA) and Total Surface Area (TSA) of cylinder

Solution :

★═══════════════════════★

CSA of cylinder = 2πrh

TSA of cylinder = 2πr² + 2πrh

                          = 2πr(r+h)

★═══════════════════════★

Radius (r) = 21 cm

Height (h) = 100 cm

CSA of cylinder is ,

➠ 2πrh

➠ 2 × π × 21 × 100

➠ 2 × ²²/₇ × 21 × 100

➠ 2 × 22 × 3 × 100

➠ 44 × 3 × 100

➠ 132 × 100

➠ 13200 cm² $\pink{\bigstar}$

TSA of cylinder is ,

➳ 2πr (r + h)

➳ 2 × ²²/₇ × 21 × ( 21 + 100 )

➳ 2 × 22 × 3 × (121)

➳ 132 × 121

➳ 15972 cm²  $\green{\bigstar}$