Question

what is the area of acircle with diameter 42cm? (×=2217)​

Answer 1

Answer:

area of circle=22/7×21×21

=22×3×21 = 1386 cm

Answer 2

Answer:

${ \huge{ \red {\bold{Solution:}}}}$

From Question Diameter = 42cm

• We know that, Radius = diameter/2
• So, Radius = 21cm

By using formula,

${ \boxed{ \sf{Area \: of \: circle = πr²}}}$

Let's find area of circle:

$: { \implies{ \sf{Area = πr² }}} \\ \\ : { \implies{ \sf{Area = \frac{22}{7} \times 21 \times 21}}} \\ \\ : { \implies{ \sf{Area = \frac{22}{{ \cancel{7}}} \times {{ \cancel{21}}}^ {3} \times 21 }}} \\ \\ : { \implies{ \sf{Area = 22 \times 3 \times 21}}} \\ \\ : { \implies{ \sf{Area =1,386c {m}^{2} }}}$

Therefore,

• Area of circle = 1386cm²