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BC = 30 cm. in given figure. Calculate the area of ∆ABC. |
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Answer» In ∆ ABD, ∵ ∠BAD = ∠ABD ∴BD = AD ….(1) In ∆ ADC, ∵ ∠DAC = ∠DCA ∴ DC = AD From (1) and (2) BD = DC = AD ⇒ AD = 1/2 BC = 1/2 x 30 = 15 cm. ∴ Area of ∆ABC = 1/2 x Base x Height = 1/2 x BC x AD = 1/2 x 30 x 15 = 225 cm2 |
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