Angle ABC = 80, angle BCD = 110. Can lines AB and CD be: 1) parallel; 1) intersecting?
| September 25, 2021 | education
Angle ABC and BCD are internal one-sided angles at the intersection of straight lines AB and CD of secant BC.
If the sum of the inner one-sided angles is 180, then lines AB and D are parallel.
Angle ABC + BCD = 80 + 110 = 190.
190 ≠ 180, therefore straight lines AB and CD intersect.
Answer: Lines AB and CD are intersecting.
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