Page 164 - Math Skill - 5

162 Maths

6. If a circle has radius 4 cm, then its diameter is

(a) 2 cm (b) 4 cm (c) 8 cm

B. Fill in the Blanks

1. Classify these angles on the basis of their measurements.
(a) 55° __________ (b) 125° _________ (c) 180° _________
(d) 205° __________ (e) 360° _________ (f) 90° _________

2. A line segment passing through the centre of a circle with its end points on the circle is a
___________ of the circle.
3. The measures of the angles corresponding to equal sides of an isosceles triangle are
__________ .

SKILL BASED QUESTIONS
C. Case Study
With the help of this chapter, we know about the geometry which is the branch of mathematics that
deals with shapes, angles, dimensions and size of a variety of things we see in everyday life.
A
Q
T B J
R C I N O
L M

U D H
P E G
S
F
(i) (ii) (iii)

Answer the following questions on the basis of the above data.
1. How many lines exist in figure (i)?

2. How many line segments exist in figure (iii)?
3. How many right angles exist in figure (ii)?
4. How many rays exist in figure (i) and figure (iii)?
5. How many acute angles exist in figure (ii)?

D. Assertion-Reason Based Questions
Directions for Questions 1 to 3: In each of the questions given below, there are two statements
marked as Assertion (A) and Reason (R). Mark your answer as per the codes provided below:

(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false. (d) A is false but R is true.
Q. 1. Assertion (A) : Ray AB is same as ray BA.

Reason (R) : Both the rays extend infinitely in one direction.