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Vidaara.orgClass 4 · Mathematics
CodeVID-M04-09-TAN-01
Types of Angles - Assignment
Chapter: Lines and Angles
Topic: Types of 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.
An acute angle is:
  • A.exactly $90^\circ$
  • B.less than $90^\circ$
  • C.more than $90^\circ$
  • D.$180^\circ$
2.
A right angle is exactly:
  • A.$45^\circ$
  • B.$90^\circ$
  • C.$180^\circ$
  • D.$60^\circ$
3.
An obtuse angle is:
  • A.less than $90^\circ$
  • B.between $90^\circ$ and $180^\circ$
  • C.exactly $90^\circ$
  • D.$180^\circ$
4.
A straight angle is exactly:
  • A.$90^\circ$
  • B.$180^\circ$
  • C.$360^\circ$
  • D.$120^\circ$
5.
A reflex angle is between:
  • A.$0^\circ$ and $90^\circ$
  • B.$90^\circ$ and $180^\circ$
  • C.$180^\circ$ and $360^\circ$
  • D.$0^\circ$ and $180^\circ$
Section B — Short Answer (2 marks) 4 × 2 = 8 marks
6.
An angle of $45^\circ$ is:
7.
An angle of $90^\circ$ is:
8.
An angle of $120^\circ$ is:
9.
An angle of $180^\circ$ is:
Section C — Short Answer (3 marks) 4 × 3 = 12 marks
10.
Classify $30^\circ$.
11.
Classify $135^\circ$.
12.
Classify $90^\circ$.
13.
Classify $200^\circ$.
Section D — Long Answer (5 marks) 2 × 5 = 10 marks
14.
Classify each angle: $25^\circ, 90^\circ, 110^\circ, 180^\circ, 300^\circ$.
15.
Name the type of angle the hands of a clock make at $3$ o'clock and at $6$ o'clock.

Answer Key

Section A — Multiple Choice Questions
  1. (B) less than $90^\circ$
  2. (B) $90^\circ$
  3. (B) between $90^\circ$ and $180^\circ$
  4. (B) $180^\circ$
  5. (C) $180^\circ$ and $360^\circ$
Section B — Short Answer (2 marks)
  1. Acute.
  2. Right.
  3. Obtuse.
  4. Straight.
Section C — Short Answer (3 marks)
  1. Acute.
  2. Obtuse.
  3. Right.
  4. Reflex.
Section D — Long Answer (5 marks)
  1. Acute, right, obtuse, straight, reflex.
  2. $3$ o'clock: right angle ($90^\circ$); $6$ o'clock: straight angle ($180^\circ$).
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