Question

the total surface area of well is 196 cm2 the radius is 4 cm find the curved surface area

Answer 1

Answer:

given :- TSA=196CM²

RADIUS= 4cm

so,

2πr²+2πrh=196

=>

$2 \times \frac{22}{7} \times 4 \times 4 + 2 \times \frac{22}{7} \times 4 \times h = 196 \\ = > \frac{44 \times 16}{7} + \frac{44 \times 4 \times h}{7} = 196 \\ = > 704 + 176h = 196 \times 7 \\ = > 704 + 176h = 1372 \\ = > 176h = 1372 - 704 \\ = > h = \frac{668}{176} \\ h = 3.79$

hence, h=3.79

CSA=2πrh = 667.07/7 cm²