The perimeter of a trapezoid is the sum of all its sides.
Perimeter of LMNO = a + b1 + a1
If a trapezoid MNPQ which is congruent to LMNO is drawn on seg.MN a parallelogram LQPO is obtained ( figure 4.6).
Area of a parallelogram LQPO = 2 Area of trapezoid LMNO
( a + a1 ) h = 2 Area of trapezoid LMNO
\ Area of trapezoid LMNO =
Area of a trapezoid is half the product of the sum of its bases with its altitude.