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6. Triangles
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Q3 of 65 Page 143

In Fig. 6.44, ABC and DBC are two triangles on thesame base BC. If AD intersects BC at O, show that

Let us draw two perpendiculars AP and DM on line BC

Area of a triangle =


Therefore,



=


In ΔAPO and ΔDMO,


∠APO = ∠DMO (Each = 90°)


∠AOP = ∠DOM (Vertically opposite angles)


∴ΔAPO ΔDMO (By AA similarity)




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1

Let Δ ABC ~ Δ DEF and their areas be, respectively, 64 cm2 and 121 cm2. If EF = 15.4 cm, find BC

2

Diagonals of a trapezium ABCD with AB || DC intersect each other at the point O. If AB = 2 CD, find the ratio of the areas of triangles AOB and COD

4

If the areas of two similar triangles are equal, prove that they are congruent

5

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Questions · 65
6. Triangles
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