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The figure below shows 8 identical semi arcs. Each arc has the radius of 5 cm.

(a) Find the total area of the shaded parts.

(b) Find the perimeter of the shaded parts.

(Take 𝝿 = 3.14)

 Jul 6, 2022
 #1
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We actually just have 4 circles each with a radius of 5  (diameter of 10)

 

Area =  4 * 3.14 * 5^2  =  100 (3.14)  = 314 cm^2

 

Perimeter  = perimeter of  8 circles + 8 diameters =   4 * 2 * (3.14) * 5  + 4 * 10  = 165.6 cm

 

cool cool cool

 Jul 6, 2022

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