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supplementary angles
add up to 180
Right angles
add up to 90
Straight Angles
add up to 180
a revolution
adds up to 360
An acute angle is between
0-90
An obtuse angle is between
90-180
Reflex angle is between
180-360
Complementary angles add up to
90
Vertically opposite angles are
equal
exterior
(outside the parallel lines)
interior
(inside the parallel lines)
alternate angles can be
exterior or interior
Alternate angles are
equal
Co-interior angles sum to
180
corresponding angles are
Equal