Vidaara.orgClass 3 · Mathematics
CodeVID-M03-09-CLA-01
Classify Angles - Assignment
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 right angle is exactly:
- A.$45^\circ$
- B.$90^\circ$
- C.$180^\circ$
- D.$60^\circ$
2.
An acute angle is:
- A.exactly $90^\circ$
- B.less than $90^\circ$
- C.more than $90^\circ$
- D.$180^\circ$
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 corner of a square is a ___ angle.
- A.acute
- B.right
- C.obtuse
- D.straight
5.
A right angle is often shown with a small:
- A.circle
- B.square
- C.dot
- D.arrow
Section B — Short Answer (2 marks)
4 × 2 = 8 marks
6.
An angle of $90^\circ$ is:
7.
An angle of $45^\circ$ is:
8.
An angle of $120^\circ$ is:
9.
A corner of a book is which kind of angle?
Section C — Short Answer (3 marks)
4 × 3 = 12 marks
10.
Classify $30^\circ$.
11.
Classify $90^\circ$.
12.
Classify $150^\circ$.
13.
Classify $80^\circ$.
Section D — Long Answer (5 marks)
2 × 5 = 10 marks
14.
Classify each angle as right, acute or obtuse: $90^\circ, 40^\circ, 100^\circ, 75^\circ$.
15.
The hands of a clock at $3$ o'clock make which kind of angle? Give its size.
Answer Key
Section A — Multiple Choice Questions
- (B) $90^\circ$
- (B) less than $90^\circ$
- (B) between $90^\circ$ and $180^\circ$
- (B) right
- (B) square
Section B — Short Answer (2 marks)
- Right.
- Acute.
- Obtuse.
- Right.
Section C — Short Answer (3 marks)
- Acute.
- Right.
- Obtuse.
- Acute.
Section D — Long Answer (5 marks)
- Right, acute, obtuse, acute.
- A right angle; $90^\circ$.
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