Question

A roof is made by using 20 triangular rocks which includes 4 different colors. The sides of each piece are 2m, 5m and 5m. How much area is covered by the colored rocks?

• A. 20
• B. 2
• C. 6
• D. 25

Answer 1

The correct option is A

20

Area of one triangular block(A) = \(\sqrt{s(s − a) (s − b) (s − c)}\)

If the sides of a triangle are a, b and c. Then the semi perimeter of the triangle = (a+b+c)/2.

s= 6; A = $\sqrt{6\ast 4\ast 1\ast 1}$

A = 20 x 2$\sqrt{6}$ $m^2$