Question

If we rotate a right-angled triangle of height $5cm$ and base $3cm$ about its height a full turn, we get

• A. (a) cone of height $5cm$, base $3cm$
• B. (b) triangle of height $5cm$, base $3cm$
• C. (c) cone of height $5cm$, base $6cm$
• D. (d) triangle of height $5cm$, base $6cm$

Answer 1

The correct option is A

(a) cone of height $5cm$, base $3cm$

Explanation for the correct option:

Here is given a right-angled triangle with $5cm$ height and $3cm$ base.

We know that the axis of a right circular cone is perpendicular to the base. A right cone can be made by rotating a right triangle around its height.

So, when we rotate the triangle along with height then it will take a shape of cone as it is shown below in the picture.

Height of the cone $=5cm$

Base of the cone $=3cm$

Hence, option (A) is the correct answer.