Vertically Opposite Angles at Intersecting Lines

Angle Properties and Additive Decomposition

4th Grade·Math·Open Global Math

Updated 1 month ago · 2 views

Recognize and prove that vertically opposite angles created by intersecting lines are equal in measure.

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Angle Properties and Additive Decomposition

4th Grade · Math · Open Global Math

6 lessons

Goal

Solve additive angle decomposition problems involving adjacent angles, angles on straight lines, angles around a point, and vertically opposite angles.

6 lessons

0 of 6 done

Adjacent Angles and Adding AnglesUp next
Complementary Angles Summing to 90 DegreesNot started yet
Angle Properties on Straight LinesNot started yet
Angles Around a Point Summing to 360 DegreesNot started yet
Vertically Opposite Angles at Intersecting LinesYou are here
Multi-Step Angle Problems with AddingNot started yet

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Learning standards covered

OGM.5.G.2Open Global Math Standards 2026™ · 4th Grade

Recognize angles as geometric turns and circular arc cuts (where a full turn is 360° and 1° is 1/360 of a circle); measure and construct angles using a protractor and set square; classify angles as acute, right (90°), obtuse, straight (180°), reflex, and full revolution (360°); solve additive angle decomposition problems.