This document discusses properties and formulas for calculating the areas of parallelograms, rhombuses, and trapezoids. It states that the area of a parallelogram is equal to its base times its height, and that opposite sides of a parallelogram are equal and parallel. The area of a rhombus is half the product of its diagonals. Finally, the area of a trapezoid is half the product of the sum of the parallel sides and the distance between them.

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2013-2014

5. PARALLELOGRAM
 b=length
 h=distance
b
C
B
D
A
h

6.  AREA OF A PARALLELOGRAM IS THE
PRODUCT OF ITS BREADTH AND HEIGHT.
 A = b x h

7.  IN A PARELLELOGRAM OPPOSITE SIDES
ARE EQUAL AND PARALLEL.

8. RHOMBUS
A
C
D
D
d1
d2
d1
d2
A
B

9.  THE AREA OF A RHOMBUS IS HALF THE
PRODUCT OF THE DIAGONALS.

10. TRAPEZIUM
D C
a b-a
A B E
b

11.  THE AREA OF TRAPEZIUM IS HALF
THE PRODUCT OF SUM OF ITS
PARALLEL SIDES AND DISTANCE
BETWEEN THEM.