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In the Given Figure Abc is a Triangle with ∠Edb = ∠Acb. Prove that δ Abc ~ δ Ebd. If Be = 6 Cm, Ec = 4 Cm, Bd = 5 Cm. and Area of δ Bed = 9 Cm2. Calculate the (I) Length of Ab (Ii) Area of δ Abc - ICSE Class 10 - Mathematics

Question

In the given figure ABC is a triangle with ∠EDB = ∠ACB.  Prove that Δ ABC ~ Δ EBD. If BE = 6 cm, EC = 4 cm, BD = 5 cm. And area of Δ BED = 9 cm2. Calculate the

(1) length of AB
(2) area of Δ ABC Solution In Δ ABC and Δ EBD,
∠ACB = ∠EDB (given)
∠ABC = ∠EBD (common)
∠ABC ~ ∠EBD (by AA- similarity).

1) We have (AB)/(BE) = (BC)/(BD) => AB = (6 xx 10)/5 = 12 cm

2)"Area of Δ ABC"/"Area of Δ BED" = ((AB)/(BE))^2

=> Area of Δ ABC =(12/6)^2 xx 9 cm = 4 xx 9 cm^2 = 36 cm^2

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2009-2010 (March) (with solutions)
Question 9.2 | 3.00 marks
Solution In the Given Figure Abc is a Triangle with ∠Edb = ∠Acb. Prove that δ Abc ~ δ Ebd. If Be = 6 Cm, Ec = 4 Cm, Bd = 5 Cm. and Area of δ Bed = 9 Cm2. Calculate the (I) Length of Ab (Ii) Area of δ Abc Concept: Similarity of Triangles.
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