IGCSE Angle Rules
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Last updated 1:50 PM on 12/8/25
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10 Terms
1
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Angles in a triangle
add up to 180 degrees
2
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Angles in a quadrilateral
Add up to 360 degrees
3
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Angles on a line
add up to 180 degrees
4
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Vertically opposite angles
are equal
5
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Alternate angles in parallel lines
are equal (make a 'Z' shape)
6
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corresponding angles in parallel lines
are equal (make a 'F' shape)
7
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To find the exterior angle in a regular shape..
360 divided by number of sides
8
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co-interior angles in parallel lines
add to 180 degrees (make a 'C' shape)
9
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Interior angle + exterior angle =
180 degrees
10
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To find total interior angles in any shape...
180 x (number of sides - 2)
Note 
Flashcards (26)