43 terms

# Math chapter 10

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Square
4 equal sides. 90 degree angles.
Rectangle
4-sided polygon
Perimeter
distance around a figure
Area
number of square units it takes to cover a figure
Base
bottom of a figure
Height
the line that makes a 90 degree angle with the base
Right Angle
90 degree angle
Triangle
3-sided polygon
Acute Triangle
3-sided polygon, 1 angle greater than 90 degrees
Obtuse triangle
...
Right Triangle
3-sided polygon. One 90 degree angle.
Isosceles Triangle
3-sided polygon. 2 congruent sides.
Equilateral Triangle
3-sided polygon. 3 congruent sides. 3 60 degree angles.
Scalene Triangle
3-sided polygon. No congruent sides
Leg
the 2 sides that make the right angle in a right triangle
hypotenuse
side opposite the right angle in a right triangle
parallelogram
4-sided quadrilateral. 2 pairs of parallel lines
parallel lines
lines that will never intersect
trapezoid
4-sided quadrilateral. 1 pair of parallel lines
congruent
same size, same shape
rhombus
4 equal-sided polygon
segment
line between two points
vertex or vericies
the point where 2 lines meet
polygon
many-sided figure, closed, straight line segment
regular polygon
polygon with congruent sides and congruent angles
irregular polygon
polygon without all congruent sides
straight angle
angle measuring 180 degrees
circle
infinite set of points equidistant from a centerpoint
half the diameter
diameter
distance across a circle through the center point
pi
ratio of circumference of a circle to its diameter, irrational; = 3.14
circumference
distance around a circle
semi-circle
half of a circle
complementary angles
angles whose sum equals 90 degrees
Supplementary angles
angles whose sum equals 180 degrees
interior angle
angles inside of a polygon
exterior angle
angle made when you extend one of the sides of the polygon outside from the polygon
pentagon
5-sided polygon
hexagon
6-sided polygon
heptagon
7-sided polygon
octagon
8-sided polygon
nonagon
9-sided polygon