Question

A right circular cylinder just encloses a sphere of radius 10cm i. find surface area of the sphere ii. Curved surface area of cylinder.

Answer 1

Question:

A right circular cylinder just encloses a sphere of radius 10cm.

1. Find surface area of the sphere.
2. Curved surface area of cylinder.

Given:

• Radius of both = 10 cm.

To Find:

1. Surface area of the sphere.
2. Curved surface area of cylinder.

Solution:

1. Surface area of sphere $= {4 \pi r}^{2}$

→ $4 \times \frac{22}{7} \times {10}^{2}$

→ $4 \times \frac{22}{7} \times 10 \times 10$

→ $\frac{88}{7} \times 10 \times 10$

→ $\frac{8800}{7}$

→ $\boxed{1256.64 \: cm}$

2. Curved surface area of cylinder = 2πrh

→ 2 × 22/7 × 10^2 {height of cylinder is radius of circle}

→ 44/7 × 10 × 10

→ 4400/7

→ 628.58 cm

Answer 2

Step-by-step explanation:

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AKASH KUMAR OR ITEMHEAVEN