Question 152031
Use the hint...
A = base*height/2
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The problem gave the following information:
height = 15 inches
base = 21 inches
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Calculate the area of the triangle by substituting in what we know into:
A = base*height/2
A = 21*15/2
A = 21*15/2
A = 157.5 square inches
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Since the coating costs $1.22 per square inch, multiply that with the area:
157.5 * 1.22 = $192.15