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# If we rotate a right-angled triangle of height 5 cm and base 3 cm about its base, we get:

(a) cone of height 3 cm and base 3 cm

(b) cone of height 5 cm and base 5 cm

(c) cone of height 5 cm and base 3 cm

(d) cone of height 3 cm and base 5 cm

**Solution:**

We know that

The definition for a right triangle states that if one of the angles of a triangle is a right angle - 90º, the triangle is called a right-angled triangle or simply, a right triangle.

Here if we rotate a right-angled triangle of height 5 cm and base 3 cm about its base, we get a cone of height 3 cm and base 5 cm.

Therefore, we get a cone of height 3 cm and base 5 cm.

**✦ Try This: **If we rotate a right-angled triangle of height 7 cm and base 5 cm about its base, we get:

(a) cone of height 5 cm and base 5 cm

(b) cone of height 7 cm and base 7 cm

(c) cone of height 7 cm and base 5 cm

(d) cone of height 5 cm and base 7 cm

We know that

The definition for a right triangle states that if one of the angles of a triangle is a right angle - 90º, the triangle is called a right-angled triangle or simply, a right triangle.

Here if we rotate a right-angled triangle of height 7 cm and base 5 cm about its base, we get a cone of height 5 cm and base 7 cm.

Therefore, we get a cone of height 5 cm and base 7 cm.

**☛ Also Check: **NCERT Solutions for Class 7 Maths Chapter 10

**NCERT Exemplar Class 7 Maths Chapter 12 Problem 18**

## If we rotate a right-angled triangle of height 5 cm and base 3 cm about its base, we get: (a) cone of height 3 cm and base 3 cm, (b) cone of height 5 cm and base 5 cm, (c) cone of height 5 cm and base 3 cm, (d) cone of height 3 cm and base 5 cm

**Summary:**

If we rotate a right-angled triangle of height 5 cm and base 3 cm about its base, we get a cone of height 3 cm and base 5 cm.

**☛ Related Questions:**

- When a torch is pointed towards one of the vertical edges of a cube, you get a shadow of cube in the . . . .
- Which of the following sets of triangles could be the lengths of the sides of a right-angled triangl . . . .
- In which of the following cases, a unique triangle can be drawn (a) AB = 4 cm, BC = 8 cm and CA = 2 . . . .

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