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

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

A 16

B 17

C 18

D 20

Solution

Correct Answer: Option C

a = \(\frac12\times15\times12\) = 90 sq.cm

b = 2a = \(\frac12\times20\times h\)

h= 18cm