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ANGLES

By Maher Naz

Angle

The amount of turn between two straight lines that have a common end point (the vertex).

Straight Angles

Angles which measure exactly 180° (degrees) are straight angles. Therefore, straight angles are straight lines. Angles are represented by the sign ϴ, called theta. That is, for straight angles, ϴ= 180°.

Right Angles

Angles which measure exactly 90° are right angles, that is, θ= 90°.

Horizontal

Vertica

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Acute Angles

Acute angles are angles which are greater than 0° but less than 90°, that is, 0° <θ< 90°.

Obtuse Angles

Obtuse angles are those which are greater than 90° but less than 180°, that is, 90° <θ< 180.

Reflex Angles

Reflex angles are angles which are greater than 180° but less than 360°, that is, 180° <θ< 360°.

Adjacent Angles

Two angles which share the same vertex (centre, usually represented by 0) and have a common side (line) are called adjacent angles.

Complementary Angles

Complementary angles are two angles which when summed equals 90°.

Supplementary Angles

Supplementary angles are two angles which when summed equals 180°.

Vertically Opposite Angles

Vertically opposite angles are the angles opposite to each other when two straight lines intersect. Their defining property is that, vertically opposite angles are equal in magnitude.

Corresponding Angles

When two parallel lines are crossed by a line called the transversal, the angles formed which are in corresponding positions, are called corresponding angles. Corresponding angles are equal in magnitude.

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