What is an angle if two adjacent angles add up to 100 degrees?
| January 4, 2021 | education
Let the angle BAD be given.
Let’s continue VA to BB1.
Then the angle B1AD will be adjacent to the angle BAD.
Let’s continue DA to DD1.
Then the angle D1AB will be adjacent to the angle BAD.
Lines DD1 and BB1 intersect at point A.
This means that the angles B1AD and D1AB are vertical and equal 100/2 = 50 degrees each.
And since the angle BAD is adjacent to the angle B1AD, therefore, the angle BAD = 180 – 50 = 130 degrees.
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