Question

Find the area of the circle whose radius is 7 cm
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Answer 1

Answer:

154 cm^2

Step by Step in Photo

Answer 2

Step-by-step explanation:

Question :-

• Find the area of circle whose radius is 7 cm.

To Find :-

• Area of circle.

Solution :-

Given :

• Radius = 7 cm

By using the formula,

${\longrightarrow{\sf Area\ of\ circle\ =\ \pi r^2}}$

Where,

• r = radius of the circle

According to the question, by using the formula, we get :

${\longrightarrow{\sf Area\ of\ circle\ =\ \pi r^2}}$

${\longrightarrow{\sf \dfrac{22}{7} \times (7)^2}}$

${\longrightarrow{\sf \dfrac{22}{7} \times 7 \times 7}}$

${\longrightarrow{\sf \dfrac{22}{7} \times 49}}$

${\longrightarrow{\sf \dfrac{22}{\cancel7} \times \cancel{49}}}$

${\longrightarrow{\sf 22 \times 7}}$

${\longrightarrow{\sf 154\ cm^2}}$

∴ Hence, area of circle is 154 cm².

More To Know :-

$\boxed{\begin {minipage}{9cm}\\ \dag\quad \Large\underline{\bf Formulas\:of\:Areas:-}\\ \\ \star\sf Square=(side)^2\\ \\ \star\sf Rectangle=Length\times Breadth \\\\ \star\sf Triangle=\dfrac{1}{2}\times Breadth\times Height \\\\ \star \sf Scalene\triangle=\sqrt {s (s-a)(s-b)(s-c)}\\ \\ \star \sf Rhombus =\dfrac {1}{2}\times d_1\times d_2 \\\\ \star\sf Rhombus =\:\dfrac {1}{2}p\sqrt {4a^2-p^2}\\ \\ \star\sf Parallelogram =Breadth\times Height\\\\ \star\sf Trapezium =\dfrac {1}{2}(a+b)\times Height \\ \\ \star\sf Equilateral\:Triangle=\dfrac {\sqrt{3}}{4}(side)^2\end {minipage}}$