Answer with Step-by-step explanation:
Complete question:
The coordinates of the vertices of the triangle are (-8,8),(-8,-4), and. Consider QR the base of the triangle. The measure of the base is b = 18 units, and the measure of the height is h = units. The area of triangle PQR is square units.
Let
P=(-8,8)
Q=(-8,-4)
QR=b=18 units
Height of triangle, h=Length of PQ
Distance formula

Using the formula
Height of triangle, h=

Area of triangle PQR=

Area of triangle PQR=

Area of triangle PQR=108 square units
Length of QR=18units
Let the coordinates of R(x,y)




......(1)
Using Pythagoras theorem


units



.....(2)
Subtract equation (2) from (1) we get


Using the value of y in equation (1)








Hence, the coordinate of R (10,-4) or (-26,-4).