Triangle PQR has sides measuring 9 feet and 10 feet and a perimeter of 24 feet. What is the area of triangle PQR? Round to the nearest square foot.
Heron's formula: Area $=\sqrt{s(s-a)(s-b)(s-c)}$
A6 square feet
B7 square feet
C19 square feet
D22 square feet
Heron's formula: Area $=\sqrt{s(s-a)(s-b)(s-c)}$
A6 square feet
B7 square feet
C19 square feet
D22 square feet