Corresponding Angles
Part of the Angles section of Coddy's Geometry journey. Lesson 32 of 62.
Take the angle in the same position at each crossing: both above the parallel, both right of the transversal. These are corresponding angles, the F shape, and with parallel lines they are equal: the second crossing is a copy of the first, slid down the transversal.
In the figure, y° sits exactly where 125° sits, one crossing lower, so y = 125. Same position, same measure: that is the whole rule.
Challenge
EasyThe marked angles are corresponding: (2x + 10)° at the top crossing, 70° at the bottom.
Find x.
Try it yourself
Solve for x
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Angles
1Meet the Angle
Your First AngleNaming AnglesAdding Adjacent AnglesDegrees and the Full TurnAcute, Right, ObtuseRecap: Adjacent Angles4Vertical Angles
Linear PairsVertical Angles Are EqualSolving with VerticalsAll Four AnglesRecap: At the Crossing7Crossing Parallel Lines
Parallel LinesCorresponding AnglesAlternate AnglesCo-interior AnglesWhich Rule Is ItRecap: The Three Pairs2Straight Lines and Supplements
Angles on a LineSupplementary AnglesThree Angles on a LineWrite the EquationRecap: Along the Line5Around a Point
Angles Around a PointThe Missing AngleEqual SlicesFour Angles, One PointRecap: The Full Turn3Right Angles and Complements
Complementary AnglesFinding the ComplementPerpendicular LinesEqual Parts of a CornerRecap: The Right Corner6The Angle Bisector
The Angle BisectorBisected ExpressionsBisecting a Straight AngleRecap: Split in Half