Question

The area of a circle whose
radius is 7 cm, will be 154 cm?​

Answer 1

Answer:

r = 7 cm

Area of the circle = πr2

= (227×7×7)

= (22×7)

= 154 cm2

Step-by-step explanation:

hope it helps you.

Answer 2

$\sf \large \underbrace{ \underline{Understanding \: concept}}$

As radius of the circle is given to be 7cm and we have to find the area of circle, we have to do only is to put value of radius of circle in the formula to find area.

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Let's do it!

★Area of circle=πr²

$\large \bf: \implies \: \: \frac{22} {\cancel{7}} \times \cancel 7 \times 7$

$\large \bf: \implies \: \: 154cm {}^{2}$

•°• The area of circle is 154cm².

$\sf \Large\underbrace{\underline{ More\: formulae\:to\:know!}}$

$\sf \circ \: \: Area \: of \: rectangle=length×breadth$

$\sf [Where \: L \: and \: B \: are \: length \: and \: breadth]$

$\sf \circ \: \: Area \: of \: Square=side²$

$\sf \circ \: \: Area \: of \: triangle= \frac{1}{2} ×base×height$

$\sf \circ \: \: Perimeter \: of \: circle=2πr$

$\sf \circ \: Perimeter \: of \: square=4×Side$