Mathematics

Problem

Consider the points

P(-2,3)

Q\left(\dfrac{9}{2},-1\right)

and

R\left(1,\dfrac{7}{2}\right)

. a. (i) Find the area of

\triangle PQR

. b. (ii) Re–write the vertices in the order

Q,\;R,\;P

and evaluate the same expression you used in part (i). Comment on any change in the result and give a reason.