In triangle ABC, BC is 10cm long and BD is 2 / 5 of BC. Find the area ratio of triangle abd and triangle ABC

In triangle ABC, BC is 10cm long and BD is 2 / 5 of BC. Find the area ratio of triangle abd and triangle ABC

Height of triangle ADC / height of triangle ABC = 6 / 10
Area of triangle ADC / area of triangle ABC
= height of triangle ADC / height of triangle ABC
＝6/10
Area of triangle abd = area of triangle ABC - area of triangle ADC = 4 / 10 * area of triangle ABC
Area ratio of triangle abd and triangle ABC = 4 / 10 = 2 / 5

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