Tamilnadu Samacheer Kalvi 4th Maths Solutions
Term 1
Chapter 1
Geometry Ex 1.4
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
(ii) Radius = 8 cm
(iii) Radius = 6 cm
Answer:
(i) Radius
= 10 cm
Diameter = 2 × radius = 2 × 10
Diameter = 20 cm
(ii)
Radius = 8 cm
Diameter
= 2 × radius = 2 × 8
Diameter
= 16 cm
(iii)
Radius = 6 cm
Diameter
= 2 × radius = 2 × 6
Diameter
= 12 cm
C. Find the radius of the circle.
(i)
Diameter = 24 cm
(ii) Diameter = 30 cm
(iii) Diameter = 76 cm
Answer:
(i)
Diameter = 24 cm
Radius= diameter = 24 =12cm
2 2
(ii) Diameter = 30 cm
Radius= diameter = 30 = 15cm
2 2
(iii) Diameter = 76 cm
Radius= diameter = 76 = 38cm
2 2
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