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Find the area of the parallelograms shown below.

Two parallelograms shown with dimensions for area calculation; one with base 10 cm and height 3.5 cm, the other with base 5 cm and height 1.9 cm.

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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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- 24(i): Area = base × height = 10 cm × 3.5 cm = 35 cm²
- 24(ii): Area = base × height = 5 cm × 1.9 cm = 9.5 cm²
- 25: Area = base × height → 96 = 6 × x → x = 96 / 6 = 16 cm
- 26: Area of triangle = (1/2) × base × height = (1/2) × 3 cm × 2 cm = 3 cm²
- 27: Area of triangle = (1/2) × base × height = (1/2) × 5 cm × 4.2 cm = 10.5 cm²
- 28: Perimeter = 4 × semicircle circumference = 4 × (π × diameter / 2) = 4 × (π × 14 cm / 2) = 4 × 7π cm = 28π cm ≈ 87.96 cm

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

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