Question

If the radius of a circle is 21cm. Find the area of the circle.​

Answer 1

➻ Question :-

If radius of a circle is 21cm. Find the area of the circle

➻ To Find :-

Area of the circle

➻ Given :-

Radius = 21cm

➻ Diagram :-

$\setlength{\unitlength}{1mm}\begin{picture}(50,55)\thicklines\qbezier(25.000,10.000)(33.284,10.000)(39.142,15.858)\qbezier(39.142,15.858)(45.000,21.716)(45.000,30.000)\qbezier(45.000,30.000)(45.000,38.284)(39.142,44.142)\qbezier(39.142,44.142)(33.284,50.000)(25.000,50.000)\qbezier(25.000,50.000)(16.716,50.000)(10.858,44.142)\qbezier(10.858,44.142)( 5.000,38.284)( 5.000,30.000)\qbezier( 5.000,30.000)( 5.000,21.716)(10.858,15.858)\qbezier(10.858,15.858)(16.716,10.000)(25.000,10.000)\put(25,30){\line(5,0){20}}\put(25,30){\circle*{1}}\put(29,26){\sf\large{21 cm}}\end{picture}$

➻ Solution :-

Area of the circle ➞ πr²

$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$ ➞ 22/7 × 21 × 21

$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$ ➞ 462 × 3

$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$ ➞ 1386 cm²

∴ The area of the circle = 1386 cm²

Answer 2

✯✯ QUESTION ✯✯

If the radius of a circle is 21cm. Find the area of the circle.

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✰✰ ANSWER ✰✰

$⇢Radius=21\:cm$

$⇢Area\:of\:Circle= {πr}^{2}$

Putting Values : -

$⇢\dfrac{22}{7}×21×21$

$⇢22×3×21$

☛$\large{\bold{\bold{\bold{\green{\sf{Area\:of\:Circle={1386cm}^{2}}}}}}}$

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★Circumference of Circle=$2πr$

★Area of Square=Side×Side

★Perimeter of Square=4×Side

★Area of Rectangle=l×b

★Perimeter of Rectangle= 2×(l+b)

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