math chapter 11 sections 1,2,3,4,5,6,7,8

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congruent triangles

2 triangles are congruent if and only if all pairs of corresponding sides and angles are congruent

vertical angles

A pair of opposite congruent angles formed by intersecting lines

corresponding angles

Angles in the same place on different lines

alternate exterior angle

Angles outside a pair of 2 lines and on opposite sides of a transversal.

complentary angles

Angles that add up 2 90 degrees

adjacent angles

Angles that have a common side and a common vertex (corner point).

A=(pie)r^2

Area of a circle

A=bh

Area of a parallelogram

A=1/2h(b1+b2)

Area of a trapezoid

A=1/2bh

Area of a triangle

area

Length times Width

Transversal Line

Line that crosses two or more parallel lines.

P=2l+2w

Perimeter of a rectangle

P=a+b+c

Perimeter of a triangle

supplementary angles

Two angles whose sum is 180 degrees

pentagon

a five-sided polygon

quadralateral

a four-sided polygon

heptagon

a seven-sided polygon

hexogon

a six-sided polygon

decogon

a ten-sided polygon

Dodecagon

a twelve-sided polygon

octagon

an eight-sided polygon

nonagon

an nine-sided polygon

alternate interior angles

angles inside 2 lines and on opposite sides of a transversal

Base

bottom of a triangle

c=d times pie

circumference of circle

parallel lines

lines in the same plane that never intersect

corresponding parts

matching parts of congruent polygons


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