Question

Find the area and circumference of a circle whose radius is 10.5 cm (Take pi = 22/7)​

Answer 1

Given:-

⌬ Radius of circle = 10.5 cm.

⠀

To find:-

⌬ Area and Circumference of circle.

⠀

Solution:-

⠀

★ Formula used

$\tt\longrightarrow{}$ $\boxed{\sf{\orange{Area~ of~ Circle = \pi r^2}}}$

⠀

$\large{\tt{\longmapsto{Area = \pi r^2}}}$

$\large{\tt{\longmapsto{\dfrac{22}{7}\times 10.5\times 10.5}}}$

$\large{\tt{\longmapsto{22\times 1.5\times 10.5}}}$

$\large{\tt{\longmapsto{346.5 cm^2}}}$

⠀

★ Formula used

$\tt\longrightarrow{}$ $\boxed{\sf{\purple{Circumference~ of~ Circle = 2\pi r}}}$

⠀

$\large{\tt{\longmapsto{Circumference = 2\pi r}}}$

$\large{\tt{\longmapsto{2\times \dfrac{22}{7}\times 10.5}}}$

$\large{\tt{\longmapsto{2\times 22\times 1.5}}}$

$\large{\tt{\longmapsto{66 cm}}}$

⠀

Hence,

Area of circle = 346.5 cm²

Circumference of circle = 66 cm

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Answer 2

Step-by-step explanation:

Given:-

⌬ Radius of circle = 10.5 cm.

⠀

To find:-

⌬ Area and Circumference of circle.

⠀

Solution:-

⠀

★ Formula used

\tt\longrightarrow{}⟶ \boxed{\sf{\orange{Area~ of~ Circle = \pi r^2}}}

Area of Circle=πr

2

⠀

\large{\tt{\longmapsto{Area = \pi r^2}}}⟼Area=πr

2

\large{\tt{\longmapsto{\dfrac{22}{7}\times 10.5\times 10.5}}}⟼

7

22

×10.5×10.5

\large{\tt{\longmapsto{22\times 1.5\times 10.5}}}⟼22×1.5×10.5

\large{\tt{\longmapsto{346.5 cm^2}}}⟼346.5cm

2

⠀

★ Formula used

\tt\longrightarrow{}⟶ \boxed{\sf{\purple{Circumference~ of~ Circle = 2\pi r}}}

Circumference of Circle=2πr

⠀

\large{\tt{\longmapsto{Circumference = 2\pi r}}}⟼Circumference=2πr

\large{\tt{\longmapsto{2\times \dfrac{22}{7}\times 10.5}}}⟼2×

7

22

×10.5

\large{\tt{\longmapsto{2\times 22\times 1.5}}}⟼2×22×1.5

\large{\tt{\longmapsto{66 cm}}}⟼66cm

⠀

Hence,

Area of circle = 346.5 cm²

Circumference of circle = 66 cm