Question

Find total surface area of a hallow globe with radius 18 cm and thickness 10mm

Answer 1

Answer:

Total surface area of hollow sphere = 4πr12 + 4πr22

Where, r1 = radius of outer surface

r2 = radius of inner surface

Here, r1 = 18 cm, thickness = 10 mm = 1 cm

⇒ r2 = 17 cm

∴ Total surface area = [4 × (182 + 172)] π = 2452 π

Hence solved ✅✅✅

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