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Published byAmberly McDaniel Modified over 9 years ago
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Circle Radius Diameter Tangent Circumference
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Angles subtended by the same chord are equal Chord
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Angle subtended by the same chord at the centre is twice that at the circumference 2a a
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Angle subtended by the same chord at the centre is twice that at the circumference 25 ○ What is the value of angle a? a a 50 ○ 2a = 180 ○ – 50 ○ 2a = 130 ○ a = 65 ○
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Cyclic Quadrilaterals
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The opposite angles of a cyclic quadrilateral add up to 180 ○ A cyclic quadrilateral is a quadrilateral whose vertices all lie on the circumference of a circle. a b Angle a + angle b = 1 80 ○
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Angle in a semi circle equal 90 ○
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Radius and Tangent 90\
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The radius and tangent are at right angles o
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Tangents to a Circle
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Two tangents from the same point to a circle are equal
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CIRCLES THE END THE END
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