Angle rules

Flashcards by checolemant, updated more than 1 year ago
Created by checolemant over 4 years ago


Level 1 Math Flashcards on Angle rules , created by checolemant on 05/15/2016.

Resource summary

Question Answer
Vertically opposite angles are equal vert. opp. angles
Adjacent angles on a straight line add to 180° adj. angles on str. line
Angles at a point add to 360 ° angles at pt
Corresponding angles on parallel lines are equal corresp. angles, ll lines
Alternate angles on parallel lines are equal alt. angles, ll lines
Co-interior angles on parallel lines add to 180 ° co-int. angles, ll lines
Angles in a triangle add to 180 ° angle sum of a triangle
the base angles of an isosceles triangle are equal base angles isos. triangle
Each angle in an equilateral triangle is 60 ° angle in equilat. triangle
The exterior angle of a triangle equals the sum of the two interior opposite angles ext. angle of a triangle
Interior angles in a quadrilateral add up to 360 ° angle sum of quad.
The interior angles of a polygon: Sum= 180 (n-2) ° where n is the number of sides int. angle sum of polygon
The exterior angles of a polygon add to 360° ext. angle sum of polygon
A triangle is isosceles if two of its sides are formed from the radii of a circle isos. triangle, =radii
Base angels of an isosceles triangle formed from the radii of a circle are equal base angles isos. triangle, =radii
The angle at the centre is twice the angle at the circumference on the same arc angles at centre
The angle in a semi circle is a right angle angle in semi-circle
Angles on the same arc are equal angles on same arc
Opposite angles of a cyclic quadrilateral add to 180 ° opp. angles, cyclic quad
The exterior angle of a cyclic quadrilateral is equal to the interior opposite angle ext. angle, cyclic quad
The angle where the radius meets the tangent is 90 ° tgt. perpendicular, rad
Tangents from a point to a circle are the same length equal tgt
The perpendicular from the centre to the chord bisects the chord perpendicular from centre to chord
The angle between a chord and a tangent is equal to the angle in the alternate (opposite) segment angle in alt seg
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