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8 questions · self-marked practice — reveal the answer and mark yourself.

Question 13 Marks
From figure, list the points which are:
  1. In the interior of $\angle\text{P}$
  2. In the exterior of $\angle\text{P}$
  3. Lie on $\angle\text{P}$
Answer
  1. Points J and C lie in the interior of $\angle\text{P}.$
  2. Points D and B lie in the exterior of $\angle\text{P}.$
  3. Points A, P and M lie on $\angle\text{P}.$
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Question 23 Marks
How many angles are formed in the figures (i), (ii) and (iii)? Name them.
Answer
  1. Three angles are formed, namely $\angle\text{ABC}, \angle\text{BAC}$ and $\angle\text{ACB.}$
  2. Four angles are formed, namely $\angle\text{ABC}, \angle\text{ADC}, \angle\text{BCD}$ and $\angle\text{BAD.}$
  3. Eight angles are formed namely $\angle\text{ADC}, \angle\text{ACD}, \angle\text{DAC,} \angle\text{ACB}, \angle\text{ABC}, \angle\text{BAC}, \angle\text{BCD}$ and $\angle\text{BAD.}$
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Question 33 Marks
Give three examples of angles from your environment.
Answer
Three examples of angles from our environment are:
  1. Angle formed by the minute and hour hands of an analog clock.
  2. Angle formed by the two adjacent walls of a room.
  3. Angle formed by the two adjacent fingers of our hand.
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Question 43 Marks
In figure, Write another name for:
  1. $\angle1$
  2. $\angle2$
  3. $\angle3$
Answer
  1. $\angle\text{BPE}$
  2. $\angle\text{PQC}$
  3. $\angle\text{DQF}$
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Question 53 Marks
Using only a ruler, draw an acute angle, a right angle and an obtuse angle in your notebook and name them.
Answer
Acute angle $\angle\text{ABC}$ Right angle $\angle\text{LMN}$ Obtuse angle $\angle\text{PQR}$
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Question 63 Marks
Give two examples each of right, acute and obtuse angles from your environment.
Answer
Two examples of right angle in our environment are:
  1. The angle formed by the two adjacent walls of a room is a right angle.
  2. The angle formed by the two adjacent edges of a book is a right angle.
Two examples of acute angle in our environment are:
  1. The angle formed between the two adjacent fingers of our hand.
  2. The angle between the two adjacent sides of the letter Z of English alphabet.
Two examples of obtuse angle in our environment are:
  1. The smaller angle formed by the two adjacent blades of a fan.
  2. The smaller angle formed by the two sloping sides of a roof of a but is an obtuse angle.
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Question 73 Marks
In Figure, write another name for:
  1. $\angle1$
  2. $\angle2$
  3. $\angle3$
  4. $\angle4$
Answer
  1. Another name for $\angle1$ is $\angle\text{BOD}.$
  2. Another name for $\angle2$ is $\angle\text{BOC}.$
  3. Another name for $\angle3$ is $\angle\text{AOC}.$
  4. Another name for $\angle4$ is $\angle\text{AOD.}$
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Question 83 Marks
What is the measure of the angle in degrees between:
  1. North and West?
  2. North and South?
  1. North and South-East?
Answer
The measure of the angle between:
  1. North and West is 90 degrees.
  2. North and South is 180 degrees.
  3. North and South-East is 135 degrees.
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