Question

find the curved surface area and total surface area if radius is 1.4 CM height is 2.1 CM​

Answer 1

We are asked to find the CSA and

TSA of Cylinder

CSA : Curved surface area

TSA : Total surface area

Given : Radius = 1.4 cm

: Height = 2.1 cm

CSA of Cylinder = 2πrh

Let's substitute the given value

Therefore:-

$CSA \: of \: Cylinder = 2πrh \\ \\ = > 2 \times \frac{22}{7} \times 1.4 \times 2.1 \\ \\ = > 2 \times 22 \times 0.2 \times 2.1 \\ \\ = > 44 \times 0.42 \\ \\ = > 18.48 \: {cm}^{2}$

$\fbox \purple { Hence the CSA of Cylinder is 18.48 cm²}$

Now Let's find the TSA of Cylinder

TSA of Cylinder = 2πr ( r + h)

Let's substitute the given value:-

Therefore:-

$TSA \: of \: Cylinder \: = 2πr ( r + h) \\ \\ = > 2 \times \frac{22}{7} \times 1.4(1.4 + 2.1) \\ \\ = > 2 \times 22 \times 0.2(3.5) \\ \\ = > 44 \times 0.7 \\ \\ = > 30.8 \: {cm}^{2} \:$

$\fbox \red {Hence the TSA of the cylinder is 30.8 cm }$

$\mathfrak \green { Mark \: It \: BRAINLIEST}$