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

16
17
18
20

Correct Answer: 18

Explanation:

a = $\frac{1}{2} \times 15 \times 12$ = 90 sq.cm

b = 2a = $\frac{1}{2} \times 20 \times h$

h= 18cm

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