Right pyramid has a square base . This square base has all equal sides where each side has length . We also know that the height of the right pyramid is which is
Now in sqare , is a right triangle with a right angle.
So by Pythogorean theorem:
We know that
Now is a right triangle with a right angle.
That's the length of the slopping edge which is
So the area of:
So the area of the triangular face is