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Recap: Parallelograms

Part of the Polygons & Quadrilaterals section of Coddy's Geometry journey. Lesson 21 of 61.

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Challenge

ABCD is a parallelogram and the side AB is extended past B, making a 68° angle with BC. Find ∠ADC, marked ?, then press Check.

Try it yourself

Find the marked part of the figure

Find the marked part of the figure

All lessons in Polygons & Quadrilaterals

1Polygons

Polygons and DiagonalsAngles of a QuadrilateralAngles in Any PolygonPolygon Angles with xHow Many Sides?Recap: Polygon Angles

4Parallelograms

ParallelogramsNeighbouring AnglesOpposite AnglesParallelograms with xA Diagonal InsideRecap: Parallelograms

7On Squared Paper

Make a ParallelogramDraw a Tilted RectangleDraw a RhombusDraw a Trapezoid and KiteRecap: Squared Paper

10Composite Shapes

Shapes Made of PartsRectangle and TriangleArea by SubtractingEnough to Find It?Recap: Composite Shapes

2Regular Polygons

Regular PolygonsFrom an Angle to the SidesInside a Regular PolygonRecap: Regular Polygons

5Rectangles, Rhombi, Squares

RectanglesThe Diagonal of a RectangleRhombus AnglesSquaresRecap: Special Parallelograms

8Area of Parallelograms

Area of a RectangleA Side from the AreaSlide the TopArea of a ParallelogramRecap: Parallelogram Area

11Polygon Chases

Parallel Sides in a PentagonMarks, Not LooksPentagon with xRegular Shapes TogetherRecap: Polygon Chases

3Exterior Angles

Exterior AnglesExterior Angles Make 360°Regular Exterior AnglesSides from the ExteriorRecap: Exterior Angles

6Trapezoids and Kites

TrapezoidsIsosceles TrapezoidsTrapezoids with xKitesRecap: Trapezoids and Kites

9Area of Trapezoids

Area of a TrapezoidA Missing BaseFind the Height FirstTrapezoids by AreaRecap: Trapezoid Area

12Final Challenges

Final: The Garden BedFinal: Enough to Finish?Final: The RampFinal: The Gable WallFinal: The Star Point