Question

A wooden article was made by scooping out a hemisphere from each end of a solid cylinder. If the height of the cylinder is 20 cm, and its base is of radius 7 cm, find the total surface area of the article.​

Answer 1

$\huge\underline\mathfrak\purple{Answer}$

We have

Height of cylinder= 10cm

radius of base= 3.5cm

Total surface area of the article =Curved surface area of the cylinder +2 surface area of a hemisphere

=2πrh+2(2πr2)

=2πr(h+2r)

=$2 \times \frac{22}{7}$×3.5(10+2×3.5)cm^2

=374cm^2

$\huge\underline\mathfrak\purple{Bts}$

Answer 2

Step-by-step explanation:

We have

Height of cylinder= 10cm

radius of base= 3.5cm

Total surface area of the article =Curved surface area of the cylinder +2 surface area of a hemisphere

=2πrh+2(2πr²)

=2πr(h+2r)

=2×22/7x3.5(10+2x3.5)cm²

= 374cm²