The length of two parallel sides of a trapezium are 15 cm

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The length of two parallel sides of a trapezium are 15 cm and 20 cm. If its area is 175 sq.cm, then its height is :

Using Rule 13,
Area of the trapezium

=	1	× (Sum of parallel sides) × height
	2

⇒ 175 =	1	(15 + 20) × h
	2

⇒	175 × 2	= h
	35

⇒ h = 10 cm