Angles

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Definition of a subtended angle - the angle created by an object at a given external point

Similar triangles - all three sides in same proportion. SSS

Similar triangles - two sides in same proportion, included angle the same. SAS

Definition of a segment of a circle.

Definition and properties of a secant

Definition and properties of scalene triangles

A complex figure has some hidden triangles

Definition of a opposite rays - two rays with a common endpoint that form a straight line .

Definition and properties of isosceles triangles

Included side definition: The common leg of two angles.

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