Punjab State Board PSEB 4th Class Maths Book Solutions Chapter 7 Shapes Ex 7.1 Textbook Exercise Questions and Answers.

## PSEB Solutions for Class 4 Maths Chapter 7 Shapes Ex 7.1

Question 1.

From the given figure write the names of the following :

(a) radius

(b) diameter

(c) chords

Solution:

(a) Radius = OC, OB, OG, OD, OE, OA

(b) Diameter = AB,EG .

(c) Chords = AF, AB, EG.

Question 2.

Find the radius of a circle whose diameter is :

(a) 6 cm

(b) 8.2 cm

(c) 8.6 cm

Solution:

(a) Diameter of the circle = 6 cm

= \(\frac{6}{2}\) cm = 3 cm

(b) Diameter of the circle = 8.2 cm

= \(\frac{8.2}{2}\) cm = 4.1 cm

(c) Diameter of the circle = 8.6 cm

= \(\frac{8.6}{2}\) cm = 4.3 cm

Question 3.

Find the diameter of a circle whose radius is :

(a) 13 cm

(b) 21 cm

(c) 17 cm

(d) 8 cm

Solution:

(a) Radius of the circle = 13 cm

Diameter of the circle = 2 × Radius

= 2 × 13 cm = 26 cm

(b) Radius of the circle = 21 cm

Diameter of the circle = 2 × Radius

= 2 × 21 cm

= 42 cm

(c) Radius of thte circle = 17 cm

Diameter of the circle = 2 × Radius

= 2 × 17 cm

= 34 cm

(d) Radius of the circle = 8 cm

Diameter of the circle = 2 × Radius

= 2 × 8 cm

= 16 cm

Question 4.

With the help of a compass draw a circle whose radius is :

(a) 5 cm

(b) 3 cm

(c) 2 cm

(d) 3.5 cm

(e) 4.6 cm

(f) 2.5 cm

Solution:

Question 5.

Which is the longest chord of a circle ?

Solution:

Diameter.

Question 6.

Fill in the blanks :

(a) A line segment which joins centre of a circle with any point on circumference is called …………

(b) Diameter of a circle = ………. × radius.

(c) The longest chord of a circle is called …….. of circle.

(d) All the radii of circle are …… in length.

Solution:

(a) Radius

(b) 2

(c) Diameter

(d) Equal

Question 7.

Fill the blank

Solution: