Parallelograms
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Useful websites
This is a good website to introduce parallelograms.
Reference Books
Teaching Outlines
Concept # 1. Introduction to parallelograms
Learning objectives
- A 4-sided flat shape with straight sides where opposite sides are parallel.
- Also opposite sides are equal in length, and opposite angles are equal.
- Squares, Rectangles and Rhombuses are all Parallelograms.
- Properties of a parallelogram are :
a. Opposite sides parallel
b. Opposite sides equal
c. Diagonals bisect each other
d. Opposite angles congruent
e. Consecutive angles supplementary.
Notes for teachers
Activity No # 1. Introducing parallelograms
- Estimated Time : 40 minutes.
- Materials/ Resources needed:
Laptop, geogebra file, projector and a pointer.
- Prerequisites/Instructions, if any:
- Knowledge of parallel lines, diagnols and angles.
- Basic figures like square, rectangle and rhombus.
- Multimedia resources: Laptop
- Website interactives/ links/ / Geogebra Applets
- Process:
- The teacher can use this geogebra file to introduce parallelograms to students.
- She can move the vertices A or B or c and observe different parallelograms formed like square, rectangle and rhombus.
- Bring their attention to measures of sides, angles and diagnols.
- Developmental Questions:
- Can you identify the figure ?
- How many sides does this figure have ?
- What do we call a figure with 4 sides ?
- Are all 4 sides equal ?
- What are parallel lines ?
- Identify the 2 sets of parallel lines.
- Spell out the differences between the figures formed with respect to sides, angles and diagnols.
- What common features do you observe in all figures/shapes formed ?
- Evaluation:
- What are parallelograms ?
- Are square, rectangle and rhombus parallelograms ?
- How many pairs of parallel lines does a parallelogram have ?
- Question Corner:
- Are all parallelograms quadrilaterals ?
- Is kite a parallelogram ?
Activity No #
- Estimated Time
- Materials/ Resources needed
- Prerequisites/Instructions, if any
- Multimedia resources
- Website interactives/ links/ / Geogebra Applets
- Process/ Developmental Questions
- Evaluation
- Question Corner
Concept # 2. Construction of parallelograms
Learning objectives
Notes for teachers
Activity No #
- Estimated Time
- Materials/ Resources needed
- Prerequisites/Instructions, if any
- Multimedia resources
- Website interactives/ links/ / Geogebra Applets
- Process/ Developmental Questions
- Evaluation
- Question Corner
Activity No #
- Estimated Time
- Materials/ Resources needed
- Prerequisites/Instructions, if any
- Multimedia resources
- Website interactives/ links/ / Geogebra Applets
- Process/ Developmental Questions
- Evaluation
- Question Corner
Hints for difficult problems
Project Ideas
Math Fun
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