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4.6 Trapezoids

The perimeter of a trapezoid is the sum of all its sides.

Perimeter of LMNO = a + b1 + a1 + b

      Figure 4.5

If a trapezoid MNPQ which is congruent to LMNO is drawn on seg.MN a parallelogram LQPO is obtained ( figure 4.6).

 

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.

[next page]

Index

4.1 Perimeter
4.2 Square
4.3 Rectangle
4.4 Parallelogram
4.5 Triangle
4.6 Trapezoids
4.7 Circles

Chapter 5

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