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help with this question!. please

 Sep 24, 2018
 #1
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(a) 

 

2cm was the radius => the area of the semicircle is 2^2 pi/2 = 2pi

the trapezoid had base 4 and 7, height 2, so (4+7)2/2 = 11

3.5 was the radius, so 12.25/2 pi = 6.125 pi

2pi+6.125pi+11 = 8.125pi+11

 

8.125 pi + 11 is the answer for (a)

 

(b)

 

4.1 is the radius, so area = 16.81 pi /2 = 8.405 pi

Area of triangle is 4.1 * 7.6 = 31.16

 

8.405 pi + 31.16 is your answer for (b)

 Sep 24, 2018

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