Question

Q.1- Three angles of a quadrilateral are 80º, 110° and 120°respectively. Determine the fourth
angle.​

Answer 1

Answer:

50 degrees

Step-by-step explanation:

110+120+80

310-360

=50 degrees

Answer 2

Answer:

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Step-by-step explanation:

Let,

∠A = 80°

∠B = 110°

∠C = 120°

∠D = x

We know that the sum of all internal angles of quadrilateral ABCD is 360°.

∠A + ∠B+ ∠C+∠D = 360°

80° + 110° + 120° + x = 360°

310° + x = 360°

x = 360° – 310°

x = 50°

Therefore, the fourth angle is 50°.