Question

find area of circle whose radius is 3.5 cm​

Answer 1

Answer:

Area of a circle = πr2

= 22/7x3.5x3.5

= 38.5 cm2

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Answer 2

Given : Radius of Circle is 3.5 cm.

Need To Find : Area of Circle.

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Diagram :

$\setlength{\unitlength}{1cm}\begin{picture}(0,0)\thicklines\qbezier(2.3,0)(2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,2.121)(0,2.3)\qbezier(-2.3,0)(-2.121,-2.121)(0,-2.3)\qbezier(2.3,0)(2.121,-2.121)(-0,-2.3)\put(0,0){\line(1,0){2.3}}\put(0.5,0.3){\bf\large 3.5\ cm}\end{picture}$

$\dag\frak{\underline { Area\;of\:Circle \::}}$

$\underline {\bf{\star Area_{(Circle)} = \pi r^{2} \:\:sq.units \:}}$

Where,

• r is the Radius of Circle & $\pi = \dfrac{22}{7}$

⠀⠀⠀⠀⠀⠀$\underline {\frak{\star\:Now \: By \: Substituting \: the \: Given \: Values \::}}$

$\qquad:\implies \sf{ Area_{(Circle)} = \dfrac {22}{7} \times 3.5^{2}}$

$\qquad:\implies \sf{ Area_{(Circle)} = \dfrac {22}{\cancel {7}} \times \cancel {12.25}}$

$\qquad:\implies \sf{ Area_{(Circle)} = 22 \times 1.75}$

⠀⠀⠀⠀⠀$\underline {\boxed{\pink{ \mathrm {  Area_{(Circle)} = 38.5\: cm^2}}}}\:\bf{\bigstar}$

Therefore,

⠀⠀⠀⠀⠀$\therefore {\underline{ \mathrm {  Area \:of\:Circle \:is\:\bf{38.5\: cm^2}}}}$

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$\large {\boxed{\sf{\mid{\overline {\underline {\star More\:To\:know\::}}}\mid}}}$

$\begin{gathered}\boxed{\begin {array}{cc}\\ \dag\quad \Large\underline{\bf Formulas\:of\:Areas:-}\\ \\ \star\sf Square=(side)^2\\ \\ \star\sf Rectangle=Length\times Breadth \\\\ \star\sf Triangle=\dfrac{1}{2}\times Breadth\times Height \\\\ \star \sf Scalene\triangle=\sqrt {s (s-a)(s-b)(s-c)}\\ \\ \star \sf Rhombus =\dfrac {1}{2}\times d_1\times d_2 \\\\ \star\sf Rhombus =\:\dfrac {1}{2}p\sqrt {4a^2-p^2}\\ \\ \star\sf Parallelogram =Breadth\times Height\\\\ \star\sf Trapezium =\dfrac {1}{2}(a+b)\times Height \\ \\ \star\sf Equilateral\:Triangle=\dfrac {\sqrt{3}}{4}(side)^2\end {array}}\end{gathered}$

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