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adjacent angle?

angles that join up

angles that join up

acute angle triangle
A triangle that has all angles less than 90°

obtuse angled triangle
A triangle that has one angle greater than 90°

scalene triangle

A triangle with no equal angles

isosceles triangle

Two equal angles and sides

equilateral triangle

all sides are equal

parallelogram

opposites are equal

plane shape

2 dimensional

Polygon
a plane shape with straight sides. all the sides and angles must be the same

Irregular Polygon
A polygon that does not have all sides equal and all angles equal.

Alternate

Corresponding

Co Interior

Formula To Find Sum Of All Interior Angles Of Polygon

n=number of sides


(n-2) x 180=




divide by 20 to get the size of each angle