Answer
a) $4$
b) $-2\pi$
c) $4.5-2\pi$
Work Step by Step
a) $\frac{1}{2}(4)(2)=4$
b) $-\frac{1}{2}(\pi(2)^2)=-2\pi$
c) $4-2\pi+\frac{1}{2}(1)(1)$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.