8th Maths

Assignment Answer key

8th Standard Unit 2 MEASUREMENTS Assignment Answer Key, 8th Maths July Month Assignment Answer key. 8th Maths English Medium Assignment Answer key

- CLASS : VIII SUBJECT
- Subject: MATHEMATICS
- UNIT :- 2 MEASUREMENTS

## Part- A

### I. One Mark Questions.

#### 1. Formulae for Area of the circle

a) 2πr b) πr2 c) a2 d) l x b

#### 2. A part of the circumference of a circle is _____.

a) Radius b) Chord c) Circular arc d) Diameter

#### 3. Approximate value of π

a) 24/7 b) 22/7 c) 7/22 d) 3.4

#### 4. If circumference of a circle is 44 cm, find diameter?

a) 7 cm b) 11 cm c) 14 cm d) 28 cm

#### 5. If radius of the big circle is double of a small circle, then the area of the big circle is _________ of the small circle

a) double b) 4 times c) 8 times d) equal

#### 6. Any two points on a circle are joined by a line segment, then the line

segment is called a

a) Circular arc b) Diameter c) Radius d) Chord

#### 7. Diameter of the circle is ______ times of Radius

a) 2 b) 1/2 c) 4 d) 1/4

#### 8. The central angle of Semi circle

a) 45° b) 90° c) 180° d) 360°

#### 9. Each part of a circle which is divided by a chord is called a_____________

a) Sector b) Segment c) Circular arc d) Semi circle

#### 10. A circular shaped gymnasium ring of radius 35cm is divided into 5 equal arcs shaded with different colours. Find the length of each of the arcs.

a) 44 cm b) 33 cm c) 22 cm d) 88 cm

### Part- B

### II. Very short answer.

#### 1. A circular shaped gymnasium ring of radius 35cm is divided into 5 equal arcs shaded with different colours. Find the length of each of the arcs.

#### 2. A spinner of radius 7.5 cm is divided into 6 equal sectors. Find the area of each of the sectors.

#### 3. From the measures given below, find the area of the sectors. (i) lengthof the arc = 48 m, r = 10 m (ii) length of the arc = 50 cm, r = 13.5 cm

#### 4. With his usual speed, if a person covers a circular track of radius 150m in 9 minutes, find the distance that he covers in 3 minutes ( π = 3 14).

#### 5. A circle of radius 120 m is divided into 8 equal sectors. Find thelength of the arc of each of the sectors.

### Part- C

### III. Short answer

### 1.The radius of a sector is 21cm and its central angle is 120°. Find (i) the length of the arc (ii) area of the sector (iii) perimeter of sector.

### Part- D

### IV.Activity

#### If the diameter of a circular garden in the picture is 19.6 m, then find its area =

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