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Vidaara.orgClass 3 · Mathematics
CodeVID-M03-05-MSS-01
Missing Side from Perimeter - Assignment
Chapter: Perimeter
Topic: Find the Missing Side Given Perimeter
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.
To find a missing side, ___ the known sides from the perimeter.
  • A.add
  • B.subtract
  • C.multiply
  • D.divide
2.
A square's side equals perimeter ___ $4$.
  • A.times
  • B.plus
  • C.divided by
  • D.minus
3.
A square has perimeter $20$ cm. One side is:
  • A.$4$
  • B.$5$
  • C.$10$
  • D.$16$
4.
The perimeter is the sum of all:
  • A.angles
  • B.sides
  • C.corners
  • D.squares
5.
Always use the same:
  • A.colour
  • B.unit
  • C.shape
  • D.angle
Section B — Short Answer (2 marks) 4 × 2 = 8 marks
6.
A square has perimeter $20$ cm. Find one side.
7.
A triangle has perimeter $12$ cm; two sides are $4$ and $5$ cm. Find the third.
8.
A square has perimeter $36$ cm. Find one side.
9.
A rectangle has perimeter $14$ cm and length $5$ cm. Find the breadth.
Section C — Short Answer (3 marks) 4 × 3 = 12 marks
10.
A square has perimeter $28$ cm. Find one side.
11.
A triangle has perimeter $20$ cm; two sides are $6$ and $8$ cm. Find the third.
12.
A rectangle has perimeter $30$ cm and length $10$ cm. Find the breadth.
13.
A 4-sided shape has perimeter $25$ cm; three sides are $5, 7, 6$ cm. Find the fourth.
Section D — Long Answer (5 marks) 2 × 5 = 10 marks
14.
A rectangle has perimeter $40$ cm and a length of $12$ cm. Find its breadth.
15.
A square field has perimeter $100$ m. Find one side, and the perimeter of a square whose sides are twice as long.

Answer Key

Section A — Multiple Choice Questions
  1. (B) subtract
  2. (C) divided by
  3. (B) $5$
  4. (B) sides
  5. (B) unit
Section B — Short Answer (2 marks)
  1. $5$ cm.
  2. $3$ cm.
  3. $9$ cm.
  4. $2$ cm.
Section C — Short Answer (3 marks)
  1. $7$ cm.
  2. $6$ cm.
  3. $5$ cm.
  4. $7$ cm.
Section D — Long Answer (5 marks)
  1. $8$ cm.
  2. Side $25$ m; bigger perimeter $200$ m.
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