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3 cards from this section. Quick, good the night before a test.
What is the radius of a circle?
Think about the central point of the circle.
How do you find the diameter from the radius?
Remember the formula D = 2R.
What is the distance from the centre of a circle to a point on the circle called?
It's half the diameter.
True or False: The diameter of a circle is the longest chord.
Think about what a chord is.
A circle has a circumference of 31.4 cm. What is the radius?
Recall the circumference formula.
If the length of the chord is 12 cm and the radius is 8 cm, find the distance from the center of the circle to the chord.
Use the right triangle properties involving radius and half of the chord length.
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