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kolezko [41]
3 years ago
10

One of the same side angles of two parallel lines is 20° smaller than the other one. Find all angles. Please explain this proble

m, I don't under stand it.
Mathematics
1 answer:
butalik [34]3 years ago
3 0
When you have parallel lines same side interior angles add up to 180 degrees.
Let the first SSI (same side interior) angle be x, and the other SSI be (x - 20).
Therefore, x + (x - 20) = 180
2x - 20 = 180
add 20  to both side
2x = 200
divide both sides by 2
x = 100
x - 20 =  100 - 20 = 80
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