Mathematics · Class 6
Mensuration
Perimeter and area of rectangles, squares, and related plane figures.
4 sections15–25 min read6 MCQs · 2 examples
Chapter Overview
Mensuration deals with perimeter and area of plane figures — rectangles, squares, and triangles. These formulas apply to fields, rooms, and borders in everyday Indian contexts.
Perimeter
Rectangle
P = 2(l + b)
Square
P = 4 × side
Triangle
P = sum of all three sides
Area
Rectangle
A = l × b
Square
A = side²
Triangle
A = ½ × base × height
Units
- Length: mm, cm, m, km
- Area: cm², m² (never cm or m alone)
- 1 m² = 10,000 cm²
Solved Examples
Step-by-step solutions — read each step before checking the final answer.
Example 1: Rectangle Area
A classroom floor is 8 m long and 6 m wide. Find area.
- 1A = l × b
- 2A = 8 × 6
Answer
48 m²
Example 2: Triangle Area
Triangle with base 10 cm and height 6 cm. Find area.
- 1A = ½ × b × h
- 2A = ½ × 10 × 6
Answer
30 cm²
Key Points to Remember
- ✓ Perimeter is total boundary length
- ✓ Area measures surface covered
- ✓ Convert units before calculating if mixed
Exam Tips
- • Write formula first, then substitute
- • Include correct units in final answer
Practice MCQs — Mensuration
Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.
Question 1 of 6Score: 0/0
Perimeter of square with side 7 cm is: