Question

for what value of x,l||m​

Answer 1

Answer:

The value of is 190° .

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Given-

∠A = 50°

∠B = x - 20°

∠C = 120°

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Step-by-step explanation:

As we know the sum of all exterior of a troangle is 360°

∠A + ∠B + ∠C = 360°

50° + (x - 20)° + 120° = 360°

50° +x - 20° + 120° = 360°

x + 150° = 360°

x = 360° - 150°

x = 210°

Thus, the value of ∠B = x - 20°

                                    = 210° - 20°

                                    = 190°

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