Angles Flashcards
Angles in a full turn equal?
360*
Angles on a straight line equal?
180*
Angles in a right angle equal?
90*
What are reflex angles?
Angles more than 180*
What are obtuse angles?
Angles more than 90*
What are acute angles?
Angles less than 90*
What are complimentary angles?
Angles that add up to 90*
What are supplementary angles?
Angles that add up to 180*
What are corresponding angles?
Angles on parallel lines are equal. F shape
What are vertically opposite angles?
They are angles that are equal and opposite each other.
What are alternative angles?
Angles on parallel lines are equal. Z shape.
What are co-interior angles?
Are angles add up to 180*
Circle theorem 1:
Arrow head
The angle at the centre is double the angle at the circumference.
Circle Theorem 2:
bow tie
Angles in the same segment are equal.
Circle theorem 3:
semi-circle
The angle in a semicircle is a right angle
Circle theorem 4:
cyclic quadrilaterals
Opposite angles in a cyclic quadrilateral add up to 180*
Circle theorem 5:
radius and tangent
The radient and tangent meet at 90*
Circle theorem 6:
external points
Two tangents meeting at external points are equal in length.
Circle theorem 7:
alternate angles
Angle in alternate segment is equal
Circle theorem 8: perpendicular chord
A line drawn from the centre perpendicular to a chord, bisects the chords
interior =
(N - 2 x 180 ) ➗ n
Exterior
360 ➗ n
