A triangular pyramid has 4 triangular faces. If all 4 have the same area, then one of them has area 1/4 of the surface area, 1836. That gives 459 sq ft as the area of one of the triangular faces.
The third answer is the correct answer
Answer:
=>. PQ
=> PQ is the altitude of this given traingle .
=>. because it is making 90° angle with QR
