Question

find the measure of the angle A in each of the figure​

Answer 1

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Sum of angles in a triangle =180.

angle b=81

angle c=45

angle a ={180-(81+45)}

=180-126

=54.

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Answer 2

Answer:

54 degree

Step-by-step explanation:

WKT,

sum of all side of a triangle is 180 degree.

let the angle be x

angle a+ angle b+ angle c= 180 degree

subsitute the value

x+ 81+ 45 = 180 degree

x + 81 = 180 - 45

x +81 = 135 degree

x = 135 - 81

x = 54 degree

verification:

angle a +angle b + angle c = 180 degree

subsitute value

54 + 81 +45 =180 degree

54 +81 = 135

135 + 45 = 180 degree

hence verified.

Angle a is 54 degree.

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