Math, asked by dp5879350, 3 months ago

Find the surface area of a sphere having radius 7 cm
1 616 sq.cm.
2 519 sq.cm
3 890 sq.cm​

Answers

Answered by Anonymous
6

Given

  • Radius of sphere = 7cm

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To find

  • Surface area of the sphere.

Solution

  • We have a sphere with radius of 7cm. Here, surface area of the sphere has been used.

TSA = 4πr²

→ TSA = 4 × 22/7 × 7 × 7

→ TSA = 4 × 22 × 7

→ TSA = 28 × 22

TSA = 616cm²

Hence,

  • Surface area of the given sphere is 616cm².

Formulas related to Volume and Surface area

\begin{array}{|c|c|c|}\cline{1-3}\bf Shape&\bf Volume\ formula&\bf Surface\ area formula\\\cline{1-3}\sf Cube&\tt l^3}&\tt 6l^2\\\cline{1-3}\sf Cuboid&\tt lbh&\tt 2(lb+bh+lh)\\\cline{1-3}\sf Cylinder&\tt {\pi}r^2h&\tt 2\pi{r}(r+h)\\\cline{1-3}\sf Hollow\ cylinder&\tt \pi{h}(R^2-r^2)&\tt 2\pi{rh}+2\pi{Rh}+2\pi(R^2-r^2)\\\cline{1-3}\sf Cone&\tt 1/3\ \pi{r^2}h&\tt \pi{r}(r+s)\\\cline{1-3}\sf Sphere&\tt 4/3\ \pi{r}^3&\tt 4\pi{r}^2\\\cline{1-3}\sf Hemisphere&\tt 2/3\ \pi{r^3}&\tt 3\pi{r}^2\\\cline{1-3}\end{array}

Attachments:
Answered by Oneioiic14
5

\begin{gathered}\bf{\underline{\underline{Given :-}}}\\\end{gathered}⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

\sf{Radius  \ = \  7cm}.

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\begin{gathered}\bf{\underline{\underline{To\:find : - }}}\\\end{gathered}

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\sf{Surface \  area}.

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  • \sf{We \ know  \ that} ,

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\large{\boxed{\boxed{\bf{ SA \  of  \ sphere = \ 4πr² }}}}

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\tt{SA \ = 4  \ x  \ 22 / 7 \  x 7² }

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\tt{SA \  =  \ 616cm² }

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\begin{gathered}\bf{\underline{\underline{So, \ Option \ 1]   \ 616cm² \  is  \ correct  }}}\\\end{gathered}

Attachments:

Anonymous: gud
Anonymous: Use m^2 instead of m² in latex :)
Oneioiic14: Sure. . i will try to edit :)
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