Question

find the radius of a sphere whose surface area is 154cmsquare.​

Answer 1

Answer:

answer is

radius of a sphere is 3.5 cm

Answer 2

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➮ Find the radius of a sphere whose surface area is 154 cm².

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$\underline{\boxed{\bold{Important\;Information}}}$  

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❏ Sphere is three dimensional shape that has no faces, edges, or vertices.

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❏ For an example of sphere we can consider a playing ball , marble etc

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$\underline{\boxed{\bold{Important\;Formulas}}}$  

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$\bold {\pink {:\leadsto \; Volume\;of \;sphere =\frac{4}{3} \pi r^{3} }}$

$\bold {\orange {:\leadsto \; Surafce \; area\;of \;sphere =4 \pi r^{2} }}$

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$\underline{\boxed{\bold{Given}}}$

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❏ Surface Area = 154 cm²

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$\underline{\boxed{\bold{Answer}}}$

Let's Start !

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First of all , let's calculate radius of sphere from given information !

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$\boxed { \bold {\red {:\leadsto \; Surafce \; area\;of \;sphere =4 \pi r^{2} }}}$

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$\bold {\blue {:\implies \; 154 \; cm^{2} = 4 \times \frac{22}{7} \times r^{2} }}$

$\bold {\green {:\implies \; 7 \times 7 \; cm^{2} = 4 \times r^{2} }}$

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$\boxed { \bold {\red {:\implies \; r = \frac {7 }{2} \; cm }}}$

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∴ Radius of sphere = 3.5 cm

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$\boxed{\boxed{\bold{\therefore Radius \; of \; sphere \;r  = \frac {7 }{2} \; cm = 3.5 \; cm }}}$

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Hope this helps u.../

【Brainly Advisor】