The base of a triangle is 15 cm and height is 12 cm. The

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The base of a triangle is 15 cm and height is 12 cm. The height of another triangle of double the area having the base 20 cm is :

Using Rule 1,
Area of the first triangle

=	1	× base × height
	2

=	1	× 15 × 12 = 90 cm²
	2

According to the question Area of the another (second) triangle = 2 × 90 = 180 cm²
∴ Area of the new triangle = 180 cm²

=	1	× 20 × height
	2

∴ Height =	180 × 2	= 18 cm
	20