vocabulary
an angle measuring between zero and 90 degrees
acute angle
x + 1 = 9
8
shape that has nine sides
nonagon
a+b+c
perimeter of a triangle
3.14 is also known as
Pi
Has the same size and shape
congruent
x + -6 = 9
15
shape that has 10 sides
decagon
1/2*b*h
area of a triangle
the number that occurs the most
mode
a quadrilateral with two pairs of adjacent congruent sides
kite
29 + -1x = 13
16
shape that has 3 sides
triangle
a 2 + b 2 = c 2
the Pythagorean theorem
tool used to measure the length of different objects
ruler
Two-dimentional shapes with many sides
polygon
46 = 47 + -1x
1
shape that has 6 sides
hexagon
b*h
Area of a rectangle or parallelogram
triangle with all sides congruent
equilateral triangle
Two lines meet at a 90 degree angle
perpendicular
2x = 10
5
shape that has 12 sides
dodecagon
2(L*W + H*W + H*L)
The surface area of a rectangular prism.
quadrilateral with both pairs of opposite sides are parallel, all the angles are not 90 degrees
parallelogram