Question

Determine the surface area of a sphere having a radius of 70 cm
​

Answer 1

Answer:

61,600 cm.sq

Explanation:

surface area of sphere = 4pi.r^2

here

r=70

surface area

= 4× 22/7× 70×70

= 61,600 cmsq.

Answer 2

Given:

• Radius of a sphere = 70cm

To find:

• Surface area of the sphere?

Solution:

• Shape of the figure is Sphere,

Where,

• Radius = 70cm

• Let radius of the sphere be r cm.

⠀⠀━━━━━━━━━━━━━━━━━━━⠀

« Now, By using the formula given below,

→ Surface area = 4πr²

→ 4 × 22/7 × 4900

→ 4 × 22 × 700

→ 88 × 700

→ 61600 cm²

∴ Hence, Surface area of a sphere is 61600 cm².

⠀⠀━━━━━━━━━━━━━━━━━━━⠀

⠀⠀⠀⠀⠀★ Formulas related to it :

• Diameter of a Sphere = 2r

• Surface Area of a Sphere = 4πr²

• Volume of a Sphere = (4/3) πr³