Q1
What is perimeter?
AThe total boundary length
BThe surface space inside
CThe height of a shape
DThe colour of a shape
ICSEClass 7 (ICSE)MathematicsCh 19 · Topic 1
Mensuration (Perimeter and Area of Plane Figures)
Mensuration involves calculating the perimeter (boundary length) and area (surface space) of plane figures like squares, rectangles, and tri
Core concept
The perimeter of a shape is the total length around its boundary, calculated by adding all side lengths.
How it works
The area of a rectangle is length × width, while the area of a triangle is (1/2) × base × height.
Why it matters
The area of a square is side × side, and the area of a circle is π × radius², using the constant pi (approximately 3.14).
Key detail
Mensuration skills are useful in real life for tasks like calculating flooring, fencing, or paint needed for a wall.
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Quick notes
• Perimeter is the total boundary length.
• Rectangle area = length × width.
• Triangle area = (1/2) × base × height.
• Square area = side × side.
• Circle area = π × radius².
• Pi is approximately 3.14.
• Mensuration helps calculate flooring and fencing.
• It's a practical, real-life maths skill.