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Find the radius of sphere whose …

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Find the radius of sphere whose surface area is 154 cm square.

Posted by Hetvi Patel 2 years, 1 month ago

CBSE > Class 09 > Mathematics

4 answers

Preeti Dabral 2 years, 1 month ago

Let the radius of the sphere be r cm.
Surface area = 154 cm²
⇒ $4\pi r^2$ = 154
⇒ $4\times{22\over7}\times r^2=154$
⇒ $r^2={{154\times7}\over4\times22}={49\over4}$
⇒ r = ${\sqrt{49\over4}}={7\over2}$
⇒ r = 3.5 cm
∴ the radius of the sphere is 3.5 cm.

0Thank You

Smriti Gupta 2 years, 1 month ago

3.5

0Thank You

Siddhi Gupta 2 years, 1 month ago

S.a=154 4πr²=154 r²=154 x 7\4 x 22 r=√49/7 r=7/2 r=3.5cm Radius of sphere is 3.5 cm

0Thank You

Shubh Goyal 2 years, 1 month ago

√10.5=3.24

0Thank You

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