Angle rules

Question	Answer
Image: 71e5619e-b867-464d-a969-49486feafeeb (image/png)	Vertically opposite angles are equal vert. opp. angles
Image: 6e833734-19ca-4e73-8be0-1a12cfb27c15 (image/png)	Adjacent angles on a straight line add to 180° adj. angles on str. line
Image: e80fd25d-d973-4551-89fb-78d53078e4a9 (image/jpg)	Angles at a point add to 360 ° angles at pt
Image: fe5dd84b-08f8-4884-8926-4d072420ad5e (image/jpg)	Corresponding angles on parallel lines are equal corresp. angles, ll lines
Image: 93fd8b02-41cc-4883-86a7-ebc1a756544a (image/png)	Alternate angles on parallel lines are equal alt. angles, ll lines
Image: 793f95a7-cbbc-48b7-8cf4-8882a030f93a (image/jpg)	Co-interior angles on parallel lines add to 180 ° co-int. angles, ll lines
Image: 0f460e7e-d787-4765-a54f-6b736539230f (image/png)	Angles in a triangle add to 180 ° angle sum of a triangle
Image: c5413593-f869-46db-9b78-cce6b4ac1374 (image/png)	the base angles of an isosceles triangle are equal base angles isos. triangle
Image: f2e4b1b0-c0aa-462b-beab-defbc0b8a7ce (image/png)	Each angle in an equilateral triangle is 60 ° angle in equilat. triangle
Image: 10a84ad7-ef29-4314-b210-5c8c0715e4b5 (image/png)	The exterior angle of a triangle equals the sum of the two interior opposite angles ext. angle of a triangle
Image: ed96e885-bdc4-45b4-a632-7c61664414ca (image/png)	Interior angles in a quadrilateral add up to 360 ° angle sum of quad.
Image: b5dc2b26-52cf-41fb-b923-d235a4d948d3 (image/png)	The interior angles of a polygon: Sum= 180 (n-2) ° where n is the number of sides int. angle sum of polygon
Image: 2ea75275-a46d-409e-ba42-685d67812a53 (image/png)	The exterior angles of a polygon add to 360° ext. angle sum of polygon
Image: 9ab4dc9f-fb9e-42bd-acae-d5533fa2bf5a (image/png)	A triangle is isosceles if two of its sides are formed from the radii of a circle isos. triangle, =radii
Image: 3c236524-b9f8-46c5-9849-031e00f89709 (image/png)	Base angels of an isosceles triangle formed from the radii of a circle are equal base angles isos. triangle, =radii
Image: 9211963b-ca3d-4b24-afad-333a5bc7e8cf (image/png)	The angle at the centre is twice the angle at the circumference on the same arc angles at centre
Image: f1e8ef2f-d66d-47e0-92b9-41015cc1bb7a (image/png)	The angle in a semi circle is a right angle angle in semi-circle
Image: fc31bc65-dd06-4aa4-a11f-c8ac53f5f29a (image/jpg)	Angles on the same arc are equal angles on same arc
Image: 7b2562c0-2e52-4f55-97cf-1aded55f3c8f (image/png)	Opposite angles of a cyclic quadrilateral add to 180 ° opp. angles, cyclic quad
Image: 48cd3332-4114-43ed-8508-a5167b02b808 (image/png)	The exterior angle of a cyclic quadrilateral is equal to the interior opposite angle ext. angle, cyclic quad
Image: 31f9eff1-e806-4b8b-b08f-812e4b3fd15e (image/png)	The angle where the radius meets the tangent is 90 ° tgt. perpendicular, rad
Image: cf4719ba-5f41-40c6-a8ad-1b50067fcf0b (image/jpg)	Tangents from a point to a circle are the same length equal tgt
Image: 6405f72a-11c0-4334-bfea-43f605a48815 (image/jpg)	The perpendicular from the centre to the chord bisects the chord perpendicular from centre to chord
Image: 533a959b-4246-4df8-9f4f-e141be94b157 (image/png)	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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	Created by checolemant almost 8 years ago