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 :
Pick one
A) 22 cm B) 20 cm C) 18 cm D) 10 cm E) None of these
Explanation:   Area of triangle, A1 = 1/2∗base∗height   =1/2∗15∗12=90cm2   Area of second triangle =2∗A1=180cm2   1/2∗20∗height=180   =&gt;height=18cm   Option 18 cm
<result>C</result>
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 :