1.

君1in figure, AFECΔGDB and 4L2. Prove that ΔADE ~AABC.2

Answer»

Solution:

[FIGURE IS IN THE ATTACHMENT]

Given:

∆FEC ∆FEC ≅ ∆GDB

EC= BD ( by CPCT)..........(1)

Given:

∠1= ∠2 AE AD ………….. …… ..(2)(Sides opposite to equal angles are equal)From eq 1 and 2AE/EC = AD/BADDE || BC(Converse of Basic proportionality Theorem)∠1 = ∠3 and ∠2 = ∠4[ Corresponding angles]

In ∆ADE and ∆ABC∠A = ∠A (Common)∠1 = ∠3 (proved above)∠2 = ∠4 (proved above)

∆ADE ~ ∆ABC [ by AAA similarity criterion]

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