Question

Please give full solution​

Answer 1

answer: angle B=80,

angle A =40,

angle ACB=60 ,

angle ECB=100,

Answer 2

Answer:

We know,

∠ACE + ∠ECD = 40 + 80 = 120

∴ ∠C = 180 - 120( Linear Pair)

∠C = 60

⇒ ∠B+ ∠A = 120 ( exterior angle of one side is equal to sum of other two                                                           interior angle)

In ΔABC,

∠A+∠B+∠C = 180 ( Angle sum Property)

If ∠A= ∠B

∵ 2∠A = 120

∴∠A= 60

∠B = 60

∠C = 60

⇒It is an Equilateral Triangle

Step-by-step explanation:

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