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Circle Terminology

Source: Ferris Wheel - pastorschott/E+/Getty Images

Two-Dimensional Shapes

Source: New York - coleong/iStock/Getty Images

 

Lesson Goals

  • Define the following circle terms:
    • Centre
    • Radius
    • Diameter
    • Circumference

Source: Gears - Hilch/iStock/Getty Images Plus

 

Try This!

How could you use the following diagram to help you estimate the area of the circle?

A square of width 7 cm is placed within a circle so that it touches the sides of the circle. That circle is then placed within a 10 cm square so that it touches the sides of the square.

Think about this problem, then move on to the next part of the lesson.

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