Find the SA if this Square Pyramid: (Don’t forget all 4 sides of the square are the same length which also means all four lateral triangles will be the same area)

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)