Management Aptitude Test 2016 Paper

(a) ∵ Area of a triangle = √s(s−a)(s−b)(s−c)

Here, a = 13, b = 20 and c = 21
∴ s =

13+20+21

2

=

54

2

= 27
∴ Area of a triangle = √27(27−13)(27−20)(27−21)
= √27×14×7×6
= √3×3×3×7×2×7×2×3
= 9 × 2 × 7 = 126m2
So, area of both triangles = 2 x 126 = 252 m2
Now area of sides = 30 x 13 + 30 x 20
= 390 + 600 = 990 m2
and area of rectangle = 30 x 21 = 630 m2
∴ Total surface area of triangular prism
= 252 + 990 + 630 = 1872 m2