Question

Find the surface area of the composite solid.

A. 446mm squared
B. 464mm squared
C. 468mm squared
D. 486mm squared

Answer 1

Answer with Step-by-step explanation:

The given figure is a cuboid.

We know that surface area(S) of cuboid is given by:

S=2(lb+bh+hl)

Where l is the length, b is the breath and h is the height

Here, l=12 mm

b=6 mm

and h=(7+2) mm=9 mm

Surface Area= 2(12×6+6×9+9×12)

=2(72+54+108)

= 2×234

= 468 mm²

Hence, Correct option is:

C. 468 mm squared