Question

finnd the value of x​

Answer 1

By exterior angle property,

x+90=80+30=110

x=110-90=20

x=20

Answer 2

Answer:

20°

angle ACB + angle CAB + angle ABC = 180°...(sum of angles of a triangle)

therefore, angle ACB = angle CAB + ane ABC - 180°.

so, angle ACB = 80+30-180

so, angle ACB = 70°.

angle ACB + angle x + angle ECD = 180°....(angles in a linear pair)

so, angle x = angle ACB + angle ECD - 180°.

so, angle x = 70° + 90° - 180°.

so, angle x = 20°

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