Answer:
Measure of Angle A is 100°
Explanation:
The sum of interior angles of a polygon is given by the formula :
(n-2)×180 (where n is the number of sides)
n = 6
(6-2)×180 =
4 × 180 = 720
So :
A + B + C + D + E + F = 720
Substitute values given in diagram (angle d is 90 as the little square indicates a right angle) (Calling angle a as x) :
x + 135 + 115 + 90 + 110 + 170 = 720
Simplify :
x + 620 = 720
Subtract 620 from both sides :
x = 720 - 620
x = 100
Measure of Angle A is 100°
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