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Example 5 - Chapter 9 Class 7 Perimeter and Area

Last updated at July 4, 2023 by

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Example 5 Find BC, if the area of the triangle ABC is 36 cm2 and the height AD is 3 cm (Fig 11.21). Height = h = AD = 3 cm Base = b = BC = ? Given, Area of ∆ABC = 36 cm2 𝟏/𝟐 × b × h = 36 1/2 × BC × 3 = 36 BC × 3/2 = 36 BC = 36 × 𝟐/𝟑 BC = 12 × 2 BC = 24 cm ∴ BC is 24 cm

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