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Vidaara.orgClass 8 · Mathematics
CodeVID-M08-15-ARP-01
Area of Basic Plane Figures - Assignment
Chapter: Perimeter & Area
Topic: 1: Area of Rectangles, Squares, Triangles, Parallelograms
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.
Area of a rectangle $=$
  • A.$l+b$
  • B.$l\times b$
  • C.$2(l+b)$
  • D.$\tfrac12 lb$
2.
Area of a square $=$
  • A.$4a$
  • B.$a^2$
  • C.$2a$
  • D.$a^3$
3.
Area of a triangle $=$
  • A.$b\times h$
  • B.$\tfrac12 b h$
  • C.$b+h$
  • D.$2bh$
4.
Area of a parallelogram $=$
  • A.$\tfrac12 bh$
  • B.$b\times h$
  • C.$b+h$
  • D.$2(b+h)$
5.
Perimeter of a rectangle $=$
  • A.$l\times b$
  • B.$2(l+b)$
  • C.$l+b$
  • D.$4l$
Section B — Short Answer (2 marks) 4 × 2 = 8 marks
6.
Find the area of a rectangle $8$ by $5$.
7.
Find the area of a square of side $6$.
8.
Find the area of a triangle, base $10$, height $6$.
9.
Find the area of a parallelogram, base $7$, height $4$.
Section C — Short Answer (3 marks) 4 × 3 = 12 marks
10.
Find the area and perimeter of a rectangle $12$ cm by $9$ cm.
11.
Find the area of a triangle, base $14$, height $9$.
12.
The area of a square is $64$ cm$^2$. Find its side and perimeter.
13.
Find the area of a parallelogram, base $15$, height $8$.
Section D — Long Answer (5 marks) 2 × 5 = 10 marks
14.
A rectangular plot is $40$ m by $25$ m. Find its area and the cost of fencing at Rs $30$ per metre.
15.
A triangle has base $20$ cm and area $150$ cm$^2$. Find its height.

Answer Key

Section A — Multiple Choice Questions
  1. (B) $l\times b$
  2. (B) $a^2$
  3. (B) $\tfrac12 b h$
  4. (B) $b\times h$
  5. (B) $2(l+b)$
Section B — Short Answer (2 marks)
  1. $40$.
  2. $36$.
  3. $30$.
  4. $28$.
Section C — Short Answer (3 marks)
  1. Area $108$ cm$^2$; perimeter $42$ cm.
  2. $63$.
  3. Side $8$ cm; perimeter $32$ cm.
  4. $120$.
Section D — Long Answer (5 marks)
  1. Area $1000$ m$^2$; cost Rs $3900$.
  2. $15$ cm.
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