Math 9 Unit 4 – Circle Geometry. Activity 3 – Chords Chord – a line segment that joints 2 points on a circle. A diameter of a circle is a chord through.

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Presentation transcript:

Math 9 Unit 4 – Circle Geometry

Activity 3 – Chords Chord – a line segment that joints 2 points on a circle. A diameter of a circle is a chord through the centre of a circle. Diameter Chord

Perpendicular lines form a 90° angle. Bisect – cuts a line in half so that each side is equal.  OC is perpendicular to AB  OC bisects AB and creates two equal line segments: AC = CB

Perpendicular to Chord: A line segment from the centre of a circle to a chord that is perpendicular divides the chord into 2 equal lines (bisects) radius

X Y In the following diagram, what is the value of angle x? what is the value of angle y?

A B O C If the Length of AC is 8 cm, what is the length of AB?

The following circle has a radius of 10m. Line CD is 6 m long. How long is line AE?

The following circle has a radius of 9cm, Line BC is 14 cm long. How long is line AD?

Practice: