Question

please givee answer is need ansre​

Answer 1

Step-by-step explanation:

at B, we find straight angle which measures 180°

as, angle A in ∆ABC is 70°

as, opposite angles in same parallel line are supplementary

Angle A in ∆ABC + Angle B in ∆ABD = 180°

70° + Angle B = 180°

Angle B = 180° - 70° = 110°

so, angle B in ∆ABC + angle B in ∆ABD = 180°

ANGLE B + 110° = 180°

Angle B = 180° - 110° = 70°

sso,

In ∆ABC,

y + 70° + 70° = 180° { angle sum property }

y + 140° = 180°

y= 40°

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