When two lines intersect, how many points do they have in common?

1. Just as two planes intersect to form a line, two lines intersect to form a point.

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.