An intersect is when a line, or polygon is 'crossed' by or touches another line or polygon.
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it the circumference of a circle
longitude
Assuming the measure of the arc refers to the angle at the centre of the circle, the answer is 180 - 150 = 30 degrees.
100 degrees
Yes Set the compass at a reasonable width. Put the point of the compass on the point of the angle. Draw an arc on each arm of the angle. With the point of the compass on where one arc intersects one arm of the angle, draw a further arc between the arms of the angle (roughly in the middle). With the point of the compass on the other arc-arm intersection, draw another arc to intersect this just drawn arc. With a straight edge join this intersection to the point of the angle - this line bisects the angle.