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Vidaara.orgClass 4 · Mathematics
CodeVID-M04-09-PRO-01
Using a Protractor - Assignment
Chapter: Lines and Angles
Topic: Using a Protractor to Measure Angles
Maximum Marks: 35
Time: 75 minutes
Name: ____________________ Roll No.: __________ Date: ____________

General Instructions

  • All questions are compulsory.
  • Section A carries 1 mark each, Section B 2 marks, Section C 3 marks and Section D 5 marks.
  • Show all working for Sections B, C and D. Only final answers are given at the end — for full solutions, raise your doubts with your teacher.
Section A — Multiple Choice Questions 5 × 1 = 5 marks
1.
A protractor measures angles in:
  • A.centimetres
  • B.degrees
  • C.grams
  • D.seconds
2.
The centre of the protractor is placed on the:
  • A.arm
  • B.vertex
  • C.scale
  • D.zero
3.
One arm should line up with the:
  • A.$90$ line
  • B.zero line
  • C.centre
  • D.$180$ line
4.
A standard protractor reads from $0^\circ$ to:
  • A.$90^\circ$
  • B.$180^\circ$
  • C.$360^\circ$
  • D.$100^\circ$
5.
You read the angle where the other arm crosses the:
  • A.vertex
  • B.scale
  • C.centre
  • D.zero
Section B — Short Answer (2 marks) 4 × 2 = 8 marks
6.
A protractor measures in:
7.
The centre of the protractor goes on the:
8.
A protractor reads from $0^\circ$ to:
9.
One arm should line up with the:
Section C — Short Answer (3 marks) 4 × 3 = 12 marks
10.
Where do you place the protractor's centre?
11.
To measure, line up one arm with which line?
12.
A right angle measures how many degrees?
13.
If one arm is on $0$ and the other on $50$, the angle is:
Section D — Long Answer (5 marks) 2 × 5 = 10 marks
14.
List the steps to measure an angle with a protractor.
15.
An angle reads $0^\circ$ on one arm and $135^\circ$ on the other. State its size and its type.

Answer Key

Section A — Multiple Choice Questions
  1. (B) degrees
  2. (B) vertex
  3. (B) zero line
  4. (B) $180^\circ$
  5. (B) scale
Section B — Short Answer (2 marks)
  1. Degrees.
  2. Vertex.
  3. $180^\circ$.
  4. Zero line.
Section C — Short Answer (3 marks)
  1. On the vertex.
  2. The zero line.
  3. $90^\circ$.
  4. $50^\circ$.
Section D — Long Answer (5 marks)
  1. Place the centre on the vertex; line up one arm with the zero line; read the scale where the other arm crosses.
  2. $135^\circ$; obtuse.
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