In this video, you will learn how to solve for missing angles using basic angle rules. PQRS is a quadrilateral with line PQ parallel to line RS. It also has four triangles(equilateral, isosceles, equilateral, and congruent ) inscribed with a common point O. Since triangle PQO is equilateral that makes each of its angles equal to 60 degrees. Also, because triangle POR is isosceles, the base angles are equal and for the congruent triangles, their base angles are also equal. I used the sum of angles at a point to find a value for the base angles of the congruent triangles and thereafter I applied the angle rule that states that the sum of angles formed between two parallel lines equals 180 to find the angle PRO
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How To Find Angles Formed Between Two Parallel Lines
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