The measure of an angle is 20 less than 3 times its supplement. Find the measure of the angle?

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2006-08-12 15:07:07 · 4 answers · asked by Roberta A 1 in Science & Mathematics ➔ Mathematics

x=3*(180-x) - 20
x=540 - 3x -20
4x=520
x=130 degree

2006-08-12 15:13:44 · answer #1 · answered by Vincent G 7 · 0⤊ 0⤋

Supplementary angles are (180 - angle) :

Let X be the angle

X = 3 * (180 - X) - 20
X = 540 - 3X - 20
X = 520 - 3X
4X = 520

Answer : X = 130

2006-08-12 15:14:52 · answer #2 · answered by Arkangyle 4 · 0⤊ 0⤋

130

2006-08-12 15:12:53 · answer #3 · answered by coltsfan3874 4 · 0⤊ 0⤋

x = 3(180 - x) - 20
x = 540 - 3x - 20
x = -3x + 520
4x = 520
x = 130

ANS : 130Â°

2006-08-12 15:42:34 · answer #4 · answered by Sherman81 6 · 0⤊ 0⤋