RD Chapter 15- Areas Related to Circles Ex-15.1 |
RD Chapter 15- Areas Related to Circles Ex-15.3 |
RD Chapter 15- Areas Related to Circles Ex-15.4 |

**Answer
1** :
Radius of the circle (r) = 4 cm

Angle at the centre subtended an arc = 30°

**Answer
2** :

Radius of the circle (r) = 5 cm 571

Length of arc = 5π/3 cm

Let θ be the angle subtended by the arc, then

**Answer
3** :

Length of an arc = 20π cm

Angle subtended by the arc = 144°

Let r be the radius of the circle, then

**Answer
4** :

Length of arc = 15 cm

Angle subtended at the centre = 45°

Let r be the radius of the circle, then

**Answer
5** :

Radius of the circle (r) = a cm

Length of arc = aπ/4 cm

Let θ be the angle subtended by the arc at the centre, then

**Answer
6** :

Radius of the sector of a circle (r) = 4 cm

Angle at the centre (θ) = 30°

**Answer
7** :

Radius of the sector of the circle (r) = 8 cm

Angle at the centre (θ) = 135°

**Answer
8** :

Area of the sector of a circle =π cm^{2}

Radius of the circle (r) = 2 cm

Let 0 be the angle at the centre, then

**Answer
9** :

Area of the sector of a circle = 5π cm^{2}

Radius of the circle (r) = 5 cm

Let 9 be the angle at the centre, then

**Answer
10** :

Let the central angle of the sector be θ.

Given that, radius of the sector of a circle (r) = 5 cm

and arc length (l) = 3.5 cm

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