Area Of Plane Figures JSS3 Mathematics Lesson Note
Download Lesson NoteTopic: Area Of Plane Figures
The area is the size of a surface.
Triangle
Area = ½ × b × h
b = base
h = vertical height
Rectangle
Area = w × h
w = width
h = height
Trapezoid (US)
Trapezium (UK)
Area = ½(a+b) × h
h = vertical height
Ellipse
Area = πab
Note: h is at right angles to b:
Square
Area = a2
a = length of side
Parallelogram
Area = b × h
b = base
h = vertical height
Circle
Area = π × r2
Circumference = 2 × π × r
r = radius
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