Question

In the following figure, the measurement of angle A is​

Answer 1

The measurement of angle A is 90 degrees

Answer 2

Answer:

60 degrees

Step-by-step explanation:

First method

we know that

exterior angle = sum of two opposite interior angles

therefore,

120 = angle A + angle B

120 = 60 +60

therefore angle A = 60 degrees.....

Second method

angle C or angle B is a equal exterior angle and they are equa

so if we take  BC as line  

then the two interior angles be 60 degrees [ 120 + x = 180 ]

then the two angles

i,e angle b and angle C be 60 degrees

we know that

sum of the angles of the triangle = 180degrees

:- 60 + 60 + x = 180

120 + x = 180

x = 180 - 120

x = 60

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