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This is a transversal line. It is transversing both of these parallel lines. This is a transversal. And what I want to think about is the angles that are formed, and how they relate to each other. The angles that are formed at the intersection between this transversal line and the two parallel lines. Learn about parallel lines, transversals, and the angles they form.

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Parallel Lines and Transversals in the Real World This is one lesson in a larger Unit Plan that covers many properties of triangles and several other theorems. It has proofs, real world problems, constructions, a unit project, assessments, and more. The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. TSWBAT solve missing angle problems using parallel transversals. Key points. A transversal is a line that intersects two or more coplanar lines, often parallel lines. Alternate interior angles are on opposite sides of the transversal and interior to the intersected lines.

Since we have a transversal which is ab and 2 parallel lines, 1 and 2 are corresponding angles. In a similar argument bc is a transversal where we have 2 parallel lines which means angles 3 and 4 must be congruent to each other. And right now we have 2 angles in each of these triangles which is enough to say that they must be similar. Dec 09, 2012 · First quarter we study lines and angles, so the lab is on parallel lines and transversals. Second quarter is congruent triangles (coming soon), third quarter is area of quadrilaterals (although I will probably re-write this one yet again) and fourth quarter is aging trees (unit on circles). If two lines are cut by a transversal so the alternate interior angles are congruent, then the lines are parallel. Proof: Example 3, p. 163 THEOREM 3.5 Alternate Exterior Angles Converse If two lines are cut by a transversal so the alternate exterior angles are congruent, then the lines are parallel. Proof: Ex. 36, p. 168