quadrilaterals
convex: 4 angles less than 180 degrees
non-convex: one interior angle greater than 180
parallelogram: 2 pairs of parallel sides, 2 pairs of opposite sides of equal length, opposite angles equal
rectangle: 2 pairs of parallel sides, 2 pairs of opposite side of equal length, opposite angles equal
rhombus: 2 pairs of parallel sides, all sides of equal length, opposite angles equal
square: 2 pairs of parallel sides, all sides of equal length, all 90 degrees
trapezium: 1 pair of parallel sides (u can sometimes define a trapezium as a quadrilateral with at least 1 pair of parallel sides; this would make all parallelograms also trapeziums
kite: 2 pairs of adjacent sides of equal length, 1 pair of opposite angles that are equal in size
a= 70 degrees
b= 120 degrees
c= 170 degrees
d= a
170
minus exterior angle to get interior angle
c= 360-170=190
180-120=60
170+120+70= 360
360-220=140
interior angle: adds up to 360 degrees
exterior angle: formed by extending one side
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