Question

The lateral surface area of a triangular prism having base as equilateral triangle of side 3cm and height 10 cm will be equal to

• A. $30c{m}^2$
• B. $60c{m}^2$
• C. $90c{m}^2$
• D. $120c{m}^2$

Answer 1

The correct option is C $90c{m}^2$

Lateral surface area of a prism = Perimeter of the base $\times$ Height
Perimeter of the base = Perimeter of the equilateral triangle of side 3cm = $3\times 3=9cm$
Height = 10cm
So, Lateral surface area of the prism $=9\times 10=90c{m}^2$