Question

${\LARGE {\mathfrak{\underline {QUESTION}}}}$

$\sf The\: radius\: of\: the\: circle\: is\: 21 \:cm. \:Then\: find \:the\: area\\\sf and\: circumference\:of\: the\: circle.$

Answer 1

${\bf {\huge {\pink{\underline {\dag{\red {QuEsTiOn}}}}}}}$

The radius of the circle is 21 cm. Then find the area of the circle

${\bf {\huge {\pink{\underline {\dag{\red {AnSwEr}}}}}}}$

${\mathfrak {\large {\pink {\underline {\dag {\red {GiVeN}}}}}}}$

• Radius of the circle =21 cm

${\mathfrak {\large {\pink {\underline {\dag {\red {SoLuTiOn}}}}}}}$

${\orange {\boxed {\boxed {\pmb {\blue {A=\pi {r}^{2}}}}}}}$

$\sf \leadsto A=\dfrac{22}{7}\times {\big(21\big)}^{2}$

$\sf\leadsto A=\dfrac{22}{7}\times 21\times 21$

$\sf\leadsto A=\dfrac{22}{\cancel{7}}\times \cancel{21}\times 21$

$\sf\leadsto A=22\times 3\times 21$

$\leadsto{\orange {\boxed {\green {\tt {A=1386\:{cm}^{2}}}}}}$

${\orange {\boxed {\boxed {\pmb {\blue {C=2\pi r}}}}}}$

$\sf \leadsto C=2\times \dfrac{22}{7}\times 21$

$\sf\leadsto C=\dfrac{44}{7}\times 21$

$\sf\leadsto C=\dfrac{44}{\cancel{7}}\times \cancel{21}$

$\sf\leadsto C=44\times 3$

$\leadsto{\orange {\boxed {\green {\tt {C=132\:{cm}}}}}}$

${\bf {\huge {\pink{\underline {\dag{\red {HoPe\:It\:HeLpS\:yOu}}}}}}}$

Answer 2

Answer:

AREA OF CIRCLE = πR²

= 22/7 × 21 × 21

= 1386 cm²

PERIMETER OF CIRCLE = 2πR

= 2 × 22/7 × 21

= 132 cm