20
Step-by-step explanation:
Remember that the angles of a triangle add up to 180;
Therefore the missing angle in the triangle can be expressed as;
180 – (x+22 + 100)
= 180 – x – 22 – 100
= 58 – x
From the illustration, also, this angel can also be expressed as (because remember that vertically opposite angles at an intersection are equal);
x + 62
Therefore;
58 – x = x + 62
58 – 62 = x + x
-4 = 2x
-2 = x
To find Angle A, by replacing the value of x with -2;
x + 22
-2 + 22
20
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