# Example 10 - Chapter 11 Class 7 Perimeter and Area

Last updated at Dec. 6, 2021 by Teachoo

Last updated at Dec. 6, 2021 by Teachoo

Transcript

Example 10 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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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.