Question 890366
The diameters of the outer and inner shells of a semi circular right prism are 30m and 28m respectively. The lenght of the prism is 120m
1.Determine the area of the base in terms of pie
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r = 15 and 14
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For a semi-circle, area = pi*r^2/2  (Notice it's the Greek letter pi, not the dessert, pie)
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Area = pi*15^2 - pi*14^2 = 29pi sq meters
That's the area of the semi-circular base.
The length is not a factor.