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
1
Answer:
∠ECD = 60°
Step-by-step explanation:
Let the ratios of the angles A, B, & C be
Then, we know that sum of all the angles of a triangle measures 180°
∴
⇒
⇒
⇒ = 30
Thus, now putting the value of 'x' we get the three angles
∠A ⇒ = 3(30) = 90°
∠B ⇒ = 2(30) = 60°
∠C ⇒ = 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
0
Answer:
45°
Step-by-step explanation:
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