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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 1 year, 9 months ago

CBSE > Class 09 > Mathematics

4 answers

Preeti Dabral 1 year, 9 months ago

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

0Thank You

Smriti Gupta 1 year, 8 months ago

3.5

0Thank You

Siddhi Gupta 1 year, 9 months 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 1 year, 9 months ago

√10.5=3.24

0Thank You

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CBSE > Class 09 > Mathematics