Question

find the volume and total surface area of a hemisphere of diameter is 7 cm ​

Answer 1

Step-by-step explanation:

Radius of hemisphere = diameter/2

= 7/2 cm

Volume of hemisphere = 2/3 π r

= 2/3 × 22/7 ×7/2

= 22/3

= 7.33 cm³

Now,

Curved surface area = 2 π r²

= 2 ×22/7 × (7/2)²

= 2 × 22/7 × 49/4

= 77 cm²

Total surface area = 3 π r²

= 3 × 22/7 ×(7/2)²

= 3 × 22/7 ×49/4

= 115.5 cm²

Answer 2

Answer:

volume=

T.S.A =

Step-by-step explanation:

vol. of a hemisphere=

$\frac{2}{3} \times \pi \times{r}^{3}$

$\frac{2}{3} \times \frac{22}{7} \times \frac{7}{2} \times \frac{7}{2} \times \frac{7}{2} = \frac{11 \times 7 \times 7}{3 \times 2} = \frac{539}{6} = 89.833 {cm}^{3}$

T.S.A=

$3\pi \times {r}^{2}$

$3 \times \frac{22}{7 } \times \frac{7}{2} \times \frac{7}{2} = 115.5$

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