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MATHEMATICS

JAMB 2006 - Question 27

Mathematics 2006 JAMB Past Questions - Question 27: In the diagram above ,|QR| is the diameter of the semicircle QR.find the area of the figure to the nearest whole number .

Choose the most appropriate option for the gap .

In the diagram above ,|QR| is the diameter of the semicircle QR.find the area of the figure to the nearest whole number .

A: 89cm

B: 70cm

C: 90cm

D: 80cm

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Correct Answer

Explanation

Area of PQRS = Lenghth x Breadth (7x10)cmsup2 = 70Area of semi circle 1/2rπsup2 = 1/2 x 22/7 x 1/2 x 7/2=19.5cmsup2 =20cmsup2(appr.)Area of the figure = (70+20)cmsup2 = 90cmsup2