Prove 11.1 theorem 7: Any lines running parallel to another line in a plane are also parallel.
(2) See the Kahn Academy video and copy the proof from President Garfield here.
(3) Let us say 4ABC is an isosceles left triangle with AB+ AC+ BC = 1. Determine its area using proof.
You are prohibited from using trigonometric facts and functions, or any other geometric results than those we have shown and basic algebra.
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