The Area of a Trapezium  Area = ½ the sum of the parallel sides x the perpendicular height A = ½(a + b)h a b h  b ½h a Area of trapezium = area of parallelogram.

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Presentation transcript:

The Area of a Trapezium  Area = ½ the sum of the parallel sides x the perpendicular height A = ½(a + b)h a b h  b ½h a Area of trapezium = area of parallelogram A = ½(a + b)h

The Area of a Trapezium Area = ½ the sum of the parallel sides x the perpendicular height A = ½(a + b)h a b h ½ah ½bh Area = ½ah + ½bh = ½h(a + b) = ½(a + b)h Area = ½ (8 + 12) x 9 = ½ x 20 x 9 = 90 cm 2 Area = ½(7 + 5) x 6 = ½ x 12 x 6 = 36 cm 2 Find the area of each trapezium 1 8 cm 12 cm 9 cm 2 5 cm 7 cm 6 cm 3 5 cm 3.9 cm 7.1 cm Area = ½( ) x 5 = ½ x 11 x 5 = 27.5 cm 2