Exercise 1.4 - Chapter 1 - Geometry - Term 1 - 4th Maths Guide Samacheer Kalvi Solutions

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A. Fill in the blanks.
(i) All the radii of a circle are
Answer:
equal
(ii) The ___ is the longest chord of a circle.
Answer:
diameter
(iii) A line segment joining any point on the circle to its center is called the ____of the circle.
Answer:
radius
(iv) A line segment with its end points on the circle is called a
Answer:
chord
(v) Twice the radius is
Answer:
diameter

B. Find the diameter of the circle
(i) Radius $=10 \mathrm{~cm}$
(ii) Radius $=8 \mathrm{~cm}$
(iii) Radius $=6 \mathrm{~cm}$
Answer:

(i) Radius $=10 \mathrm{~cm}$
Diameter $=2 \times$ radius $=2 \times 10$
Diameter $=20 \mathrm{~cm}$
(ii) Radius $=8 \mathrm{~cm}$
Diameter $=2 \times$ radius $=2 \times 8$
Diameter $=16 \mathrm{~cm}$
(iii) Radius $=6 \mathrm{~cm}$
Diameter $=2 \times$ radius $=2 \times 6$
Diameter $=12 \mathrm{~cm}$

C. Find the radius of the circle.
(i) Diameter $=24 \mathrm{~cm}$
(ii) Diameter $=30 \mathrm{~cm}$
(iii) Diameter $=76 \mathrm{~cm}$
Answer:
(i) Diameter $=24 \mathrm{~cm}$
Radius $=\frac{\text { diameter }}{2}=\frac{24}{2}=12 \mathrm{~cm}$
(ii) Diameter $=30 \mathrm{~cm}$
Radius $=\frac{\text { diameter }}{2}=\frac{30}{2}=15 \mathrm{~cm}$
(iii) Diameter $=76 \mathrm{~cm}$
Radius $=\frac{\text { diameter }}{2}=\frac{76}{2}=38 \mathrm{~cm}$