ANGLE PROPERTIES.

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Presentation transcript:

ANGLE PROPERTIES

Names of angles ACUTE angles angles between 0o and 90o RIGHT angles angles of 90o OBTUSE angles angles between 90o and 180o REFLEX angles angles greater than180o

right-angled triangle Names of triangles equilateral triangle isosceles triangle right-angled triangle right-angled isosceles triangle scalene triangle

Angle properties Angles on a straight line Angles at a point Vertically opposite angles

Angle properties Angles in a triangle Exterior angles of a triangle Angles in a quadrilateral

Parallel and perpendicular lines Parallel lines Perpendicular lines

Angle properties of parallel lines Corresponding angles Alternate angles Interior angles

Examples 1 Calculate the size of each lettered angle. opposite angles angles on a straight line opposite angles

Examples 2 Calculate the size of each lettered angle. isosceles triangle angles in a triangle

Examples 3 Calculate the size of angle a. angles in a quadrilateral

Examples 4 Calculate the size of angle a. corresponding angles

Examples 5 Calculate the size of angle a. interior angles

Examples 6 Calculate the size of angle a. alternate angles