Hello, proofsRkickingmybutt!
Prove that the tangents to a circle at the endpoints of a diameter are parallel.
State what is given, what is to be proved, and your plan of proof.
Then write a twocolumn proof. Code:
A
P     * * *     Q
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R     * * *     S
B
There is a Theorem that says:
. . If a line is tangent to a circle, the radius drawn to
. . the point of tangency is perpendicular to the tangent.
We have a circle with center and diameter
Line is tangent to circle at
Line is tangent to circle at
. . . . .
. .
. . . . . . . . .
. . . . . . . . . . .