Question

Pls solve it I need it fast​

Answer 1

✰ Solution :

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☞︎︎︎ Given :

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• AB = 14cm

• BC = 28cm

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• We see , if we cut the figure....

☆ we get -

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• ABCD a rectangle

• BC a semi - circle

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☞︎︎︎ Finding Perimeter :

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• Length = 28cm

• Breadth = 14cm

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$\large \boxed{ \mathtt{perimeter = 2(lengt + breadth)}}$

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➪ Perimeter = 2(28cm + 14cm)

➪ Perimeter = 2(42cm)

∴ Perimeter of rectangle = 84cm

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• Finding Circumference of semi circle :

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• Radius = half of diameter

• Diameter = 28cm

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$\large \mapsto \: \: \mathtt{ \dfrac{diameter}{2} } \\ \\ \\ \rightarrow \large \: \: \mathtt{ radius = \frac{ \cancel{28} \: 14}{ \cancel2} = 14cm }$

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☞︎︎︎ Circumference of circle = 2πr

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$\large \mapsto \mathtt{cir. \: of \: semi - circle } \\ \\ \large \mathtt{ \implies \: \frac{ \cancel2\pi r}{ \cancel2} } \\ \\ \large \boxed{ \mathtt{ = \pi r}}$

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$\large \implies \mathtt{ \dfrac{22}{7} \times 14} \\ \\ \\ \large \implies \mathtt{ \dfrac{22}{ \cancel7} \times \cancel{14} \: \: 2} = 44$

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∴ Circumference = 44cm

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• Total Perimeter of figure

= Perimeter of circle + Circumference of circle

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➪ Total Perimeter = 84cm + 44cm

$\\ \large \rm \boxed{ \rm \looparrowright \: toatl \: \: perimeter = 128cm}$