IGCSE Angle Rules
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10 Terms
1
Angles in a triangle
add up to 180 degrees
2
Angles in a quadrilateral
Add up to 360 degrees
3
Angles on a line
add up to 180 degrees
4
Vertically opposite angles
are equal
5
Alternate angles in parallel lines
are equal (make a 'Z' shape)
6
corresponding angles in parallel lines
are equal (make a 'F' shape)
7
To find the exterior angle in a regular shape..
360 divided by number of sides
8
co-interior angles in parallel lines
add to 180 degrees (make a 'C' shape)
9
Interior angle + exterior angle =
180 degrees
10
To find total interior angles in any shape...
180 x (number of sides - 2)
Note 
Flashcards (92)