How to calculate the area of a triangle, a parralelogram, a trapezium, and a kite

We can easily find the area of specific shapes once we know their formula's. The following formula's will help you find the area's of each shape.


A Triangle is a polygon with 3 sides

Area = ½ × b × h
b = base
h = vertical height


A Parallelogram is a quadrilateral with 2 pairs of parallel sides

Area = b x h
b = base
h = vertical height


A Trapezium is a quadrilateral with 1 pair of parallel sides

Area = ½(a+b) × h
h = vertical height
a+b = combined length of the parallel sides


A Kite is a quadrilateral with:
- 2 pairs of sides that are equal in length and adjacent (next to each other)
- the angles in between the unequal sides are opposite and equal
- diagonals (the line that connect opposite corners) intersect at right angles

Area = (½) x d1 d2
d1 = length of short diagonal of kite
d2 = length of long diagonal of kite

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