Rectangle
The area is the number of equal squares in the rows and columns.
A = length x width
LLL - Area
Area Foundations
Rectangles and parallelograms first. Triangle base and height identification comes after the first mixed drill.
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Year 8
Area of rectangles, parallelograms, and triangles
The lesson begins with rectangle and parallelogram area, then a 70-question mixed drill. The triangle section starts after that with clickable base and height identification.
1. Rectangle and parallelogram
5 + 5 fixed
Uniform questions for whole-class demonstration.
2. Mixed area drill
70 questions
Rectangles and parallelograms only.
3. Triangle section
5 + 50 + 10 + 50
Click base and height first, then calculate area.
Teach
Start with shapes that use base times height
Rectangles multiply two perpendicular side lengths. A parallelogram can be cut and moved into a rectangle, so it uses base times height as well. The slanted side is not the height.
Parallelogram
Use the base and the perpendicular height. Ignore the slanted side for area.
A = base x height
Why it works
Move the side triangle from one end to the other and the parallelogram becomes a rectangle.
same base, same height
Triangle section
Identify base and perpendicular height before area
Students first answer by clicking a line or measurement in the diagram. Only after the identification section do they move to triangle area.
Base
The base is the side chosen as the bottom or reference side for the height.
Height
The height is perpendicular to the base. It is not always a side of the triangle.
Common trap
The slanted side is a side length, but it is not the perpendicular height.
Area later
When the base and height are clear, area is half of base times height.
A = 1/2 x b x h
Section
Question
Enter your answer, then check it.
Summary
Area foundations complete
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