Circle Formulae 2 The area of a circle Must-Sulist Click the mouse.

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1 Circle Formulae 2 The area of a circle Tandi Clausen-May Click the mouse.

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Circle Formulae 2 The area of a circle Tandi Clausen-May

Presentation transcript:

Circle Formulae 2 The area of a circle Must-Sulist Click the mouse

Click the mouse only when you see or If you click too soon you will miss the best bits. Click the mouse Click to see Click the mouse

The area of a circle Click the mouse Must-Sulist

Circumference =  × Diameter Now, what about the area? We saw in Circle Formulae 1 that… Circumference =  × Diameter Now, what about the area? Click the mouse

Click to see the circle open Imagine a circle made out of strands of beads. Open it out. Click to see the circle open Click the mouse

Click to see the circle open again Let’s watch that again. Click to see the circle open again radius (half the diameter) circumference It’s a triangle! base = circumference height = radius (half the diameter) Click the mouse

circle Area of the triangle We know how to find the area of a triangle. radius (half the diameter) circumference circle Area of the triangle Area of the triangle = Base × Height 2 = Circumference × Radius 2 Click the mouse

Summary = Circumference × Radius 2 Area Click the mouse

Area of circle

EXERCISE Calculate the area of a circle with diameter 9 cm Calculate the exact area of circles with the radius below: a. 2.8 cm c. 35 cm b. 12 cm d. 50 cm 3. Calculate the area of the shaded region as shown in the figure below:

Determine the circumference of the shaded parts in the figure below

The End Must-Sulist