1.

PLEASE SOLVE ITS URGENT CORRECT ANSWER WILL GET BRAINLIST

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Answer:

1.78

Step-by-step explanation:

In ΔABC and ΔDCE ,

∠ACD = ∠BCE

►∠ACD+∠DCB = ∠BCE+∠DCB  (adding ∠DCB each SIDE)

►∠ACB = ∠DCE    (first angle)

∠ABC = ∠DEC  (ACCORDING to QUES.)   (second angle)

third angle will be EQUAL too.

So, ΔABC and ΔDCE are SIMILAR .

Now, \frac{area\ of\ \triangle ABC }{area\ of\ \triangle DEC } = \frac{AB^2}{DE^2} = \frac{10.4^2}{7.8^2} = 1.78



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