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# math chapter 13

Similar figures are? They have the exact same shape but NOT the same size.
Congruent figures are? =~ They have the exact same shape AND size.
Lines of symetry? - Separates the figue into two matching halves.
Rotational symetry? -Some figures can be turned less than 360 degrees and look exactly as it did before it turned.
Triangle? -180 degrees all together.
Equilateral triangle? -all sides and all angles congruent.
Isosceles triangle? - 2 congruent sides 2 congruent angles.
Scalene triangle? - No equal sides.
Pentagon? - 5 sides and 5 angles
Hexagon? - 6 sides,6 angles
Octagon? - 8 sides, 8 angles
Regular pentagon? - all sides and all angles are congruent.
Heptagon? - 7 sides, 7 angles
Square? - all sides and all angles are congruent =360 degrees.
Rectangle? - all angles are congruent, 2 pairs of congruent sides.
Quadrilateral? - 4 sides and 4 angles.
Parallelogram? - 2 pairs of congruent sides and 2 pairs of congruent angles.
Rhombus? - 4 equal sides, 2 pairs of congruent angles.
Angles? 2 sides that share a common end point called the vertex.
Right angle? 90 degrees
Straight angle? Exactly 180 degrees.
Acute angle? 89 degrees or less.
Obtuse angle? Between 91 and 179 degrees.
Reflex angle? Larger than 180 less than 360 degrees.
Complementary angles? - two angles whose degrees equal exactly 90.
Supplementary angles? - two angles whose degrees are exactly 180.
Adjacent angles? - Share a common side.
Vertical angles? - formed by a pair of lines that intersect.