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Standard VIII

Mathematics

Circle Mensuration

A semi-circul...

Question

A semi-circular shaped window has diameter of $63 c m$ . Its perimeter equals: (take $π = \frac{22}{7}$ )

126 c m

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162 c m

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198 c m

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251 c m

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Solution

The correct option is B $162 c m$
Perimeter of semi-circle $= π r + 2 r$

$= \frac{22}{7} \times \frac{63}{2} + 2 \times \frac{63}{2}$

$= 11 \times 9 + 63$

$= 99 + 63$

$= 162 c m$

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A semi-circular shaped window has diameter of 63cm. Its perimeter equals: (take π=227)

The correct option is B 162cmPerimeter of semi-circle =πr+2r =227×632+2×632 =11×9+63 =99+63 =162 cm

A semi-circular shaped window has diameter of $63 c m$ . Its perimeter equals: (take $π = \frac{22}{7}$ )

The correct option is B $162 c m$
Perimeter of semi-circle $= π r + 2 r$

$= \frac{22}{7} \times \frac{63}{2} + 2 \times \frac{63}{2}$

$= 11 \times 9 + 63$

$= 99 + 63$

$= 162 c m$