Perimeter and Area worksheet from Chapter 11, featuring key formulas and practice problems.

Chapter 11 Perimeter and Area worksheet with formulas and questions on calculating perimeter and area of various shapes.

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Show Answer Key & Explanations Step-by-step solution for: CBSE Class 7 Mental Maths Perimeter And Area Worksheet

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1. Area = base × height = 5 cm × 3 cm = 15 cm².
2. Area = ½ × base × height = ½ × 7 cm × 4 cm = 14 cm².
3. Area = ½ × BC × AD → 49 = ½ × BC × 7 → BC = (49 × 2) / 7 = 14 cm.
4. Area = base × height → 17.6 = 4 × height → height = 17.6 / 4 = 4.4 cm.
5. Area = length × breadth → 440 = 22 × breadth → breadth = 440 / 22 = 20 cm. Perimeter = 2 × (length + breadth) = 2 × (22 + 20) = 84 cm.
6. Perimeter = 2 × (length + breadth) → 100 = 2 × (35 + breadth) → 50 = 35 + breadth → breadth = 15 cm.
7. Let length = 4x, breadth = 3x. Perimeter = 2 × (4x + 3x) = 14x = 140 → x = 10. Length = 40 cm, breadth = 30 cm. Area = 40 × 30 = 1200 cm².
8. Let length = 9x, breadth = 5x. Perimeter = 2 × (9x + 5x) = 28x = 280 → x = 10. Length = 90 m, breadth = 50 m. Area = 90 × 50 = 4500 m².

Parent Tip: Review the logic above to help your child master the concept of area and perimeter worksheet grade 7.

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