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P(7)= 1/30
When two nonvertical straight lines intersect they form two congruent pair of nonadjacent angles, which are called the vertical angles (or vertical opposite angles). So that one of the three vertical angles is 30 degrees, and the other two angles have a measure of 150 degrees each, since they are adjacent to a 30 degrees angle.
Normally one side is Imperial: 12 inches (in fractions of an inch), and the other side is metric: 30 centimetres, with numbered centimetres and millimetre marks.
yes, two lines can be coplanar.
A drawing of a 30 degree angle!