Area and Perimeter

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Mathematics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

Add all the sides for perimeter (cm). Area fills the inside, so it is in square units (cm²).

Rectangle: l×w. Triangle: ½×b×h. Trapezium: ½(a+b)h. Use the straight-up height, not the slant.

Check if you are given radius or diameter - d = 2r. Mixing them up is the most common circle error.

An L-room is two rectangles; a track is a rectangle plus a circle. Sketch and label every length first.

perimeter	the total length of the boundary of a shape, found by adding all the sides
area	the amount of flat surface inside a shape, measured in square units
perpendicular height	the height measured at a right angle (90°) to the base, not along a slant
circumference	the perimeter of a circle - the distance around its curved edge
radius	the distance from the centre of a circle to its edge; half the diameter
sector	a slice of a circle bounded by two radii and the arc between them
arc	a portion of the circumference - part of the curved boundary of a circle
composite shape	a shape built by joining simpler shapes such as rectangles, triangles and circles

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