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In figure (2) given below, area of ∆ABD is 24 sq. units. If AB = 8 units, find the height of △ABC.

In figure (2) given below, area of ∆ABD is 24 sq. units. If AB = 8 units, find the height of △ABC. Theorems on Area, ML Aggarwal Understanding Mathematics Solutions ICSE Class 9.

Theorems on Area

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Answer

Given,

Area of ∆ABD = 24 sq. units

As ∆ABD and ∆ABC lie on same base AB and between same parallel lines AB and CD so,

Area of ∆ABC = Area of ∆ABD = 24 sq. units.

12\dfrac{1}{2} × AB × height = 24

12\dfrac{1}{2} × 8 × height = 24

⇒ 4 × height = 24

⇒ Height = 244\dfrac{24}{4}

⇒ Height = 6 units.

Hence, height of ∆ABC = 6 units.

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