Math, asked by nishikasinha, 1 month ago

answer this question with step by step explanation class 7 And who ever will give me the correct answer I will mark him or her as brainlist​

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Answered by anuj05slg
1

Answer:

∠ECD =  60°

Step-by-step explanation:

Let the ratios of the angles A, B, & C  be   3x : 2x : 1x

Then, we know that sum of all the angles of a triangle measures 180°

∴  3x + 2x + 1x  =  180

6x = 180

⇒  x = \frac{180}{6}

x = 30

Thus, now putting the value of 'x' we get the three angles

∠A ⇒ 3x =  3(30) = 90°

∠B ⇒ 2x  =  2(30) = 60°

∠C ⇒ x    = 30°

Now, we also know that a straight line is of 180°

so,  ∠ACB + ∠ACE + ∠ECD =  ∠BCD

    ⇒  30°  +   90°   + ∠ECD = 180°

    ⇒   120° + ∠ECD = 180°

    ⇒  ∠ECD = 180° - 120°

                     =  60° (ans)

Hence,  ∠ECD =  60°

Hope this will help you !!!

Pls mark as brainliest !!!

Answered by dithuraghav
0

Answer:

45°

Step-by-step explanation:

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