Question

If radius of a circle is 21 cm then its area is ____cm²​

Answer 1

Answer:

If radius of a circle is 21 cm then it's area is 1386 cm square.

Step-by-step explanation:

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Answer 2

$\Large{\bold{\mathtt{\purple{Given\::}}}}$

• $\normalsize{\sf{Radius\:=\:21\:cm}}$
• $\normalsize{\sf{\pi\:=\:{\frac{22}{7}}}}$

${ }$

$\Large{\bold{\mathtt{\purple{Find\::}}}}$

• $\normalsize{\sf{Its\:Area}}$

${ }$

$\Large{\bold{\mathtt{\purple{Solution\::}}}}$

• $\large{\sf{Area\:of\:the\:circle\:=\:\pi\:{r}^{2}\:sq\:units}}$

$\:\:\:\:\:\:\:\:\:\::\:\Longrightarrow{\normalsize{\frac{22}{7}}\:×\:21\:×\:21}$

$\:\:\:\:\:\:\:\:\:\::\:\Longrightarrow{\normalsize{\sf{22\:×\:3\:×\:21}}}$

$\:\:\:\:\:\:\:\:\:\::\:\Longrightarrow{\normalsize{\sf{1386\:cm}}^{2}}$

${ }$

$\:\:\:\:\:\:\:\:\therefore{\:\underline{\sf{Area\:of\:circle\:is}\:{\bold{1386\:cm}^{2}}}}$