Where do Area Formulas Come From?
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Where do Area Formulas Come From?
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Where do Area Formulas Come From?. Important Terms: Base and Height. Base and height always make a right angle. The Rectangle: A Basic Shape. The Basic Grid: 12 units 2. A = bh. The Parallelogram. A = bh. The Triangle. A = ½ bh. The Trapezoid. Summary. Area of a rectangle = bh - PowerPoint PPT Presentation
Transcript of Where do Area Formulas Come From?
Where do Area Formulas Come From?
Important Terms: Base and HeightBase and height always make a right angle.
The Rectangle: A Basic Shape
The Basic Grid: 12 units2 A = bh
The Parallelogram
A = bh
The Triangle
A = ½ bh
The Trapezoid
Area of a rectangle = bh Area of a square = s2
Area of a triangle = ½ bh Area of a trapezoid = ½ h(base 1 + base 2)
Summary
Area of a Circle
A =πr2
Easy Way to Memorize Circle Formulas
Circumference Formula Area Formula
“Cherry pie’s delicious, apple pies are too”
A =πr2C =πd
What are the area formulas for these shapes?
The Semicircle The Quarter-Circle
