Decide Whether the Following Problem Can Be Solved Using Precalculus

Multiple Choice

Decide whether the following problem can be solved using precalculus, or whether calculus is required. If the problem can be solved using precalculus, solve it. If the problem seems to require calculus, use a graphical or numerical approach to estimate the solution. ​
Find the area of the shaded region bounded by the triangle with vertices (0,0) , (7,8) , (15,0) .
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A) precalculus , 120
B) calculus , 180
C) precalculus , 60
D) precalculus , 180
E) calculus , 120