Vocabulary
Perimeter
The distance around the edge of a shape
A triangle with one 90 degree angle
Right triangle
Circumference
The distance around the boundary of a circle
The interior angles of a quadrilateral total this many degrees
360 degrees
A device used to measure angles
Protractor
Area
The space enclosed by the boundary of a plane (two dimensional) figure
Obtuse Triangle
A triangle with one angle greater than 90 degrees
A circle has this many degrees around its center
360 degrees
The perimeter of a rhombus with a side of 4 meters
16 meters
A straight angle has this many degrees
180 degrees
Part of a line that has two ends
Segment
The interior angles of a triangle total to this many degrees
180 degrees
The distance from the center of a circle to its boundary
Radius
Parallelogram
A quadrilateral with both pairs of opposite sides parallel and equal
A polygon with 12 sides
Dodecagon
This is formed by two rays with the same endpoint
The formula for area of a triangle
1/2 x base x height
A circle
The set of all points equidistant from the center in a two dimensional plane
The perimeter of a regular octagon with a side length of 8 meters
64 meters
Isosceles triangle
A triangle with at least two equal sides
The volume of a cube with a side of 1 cm is measured in these units
cm^3
or
cubic centimeters
It is impossible to have this angle in an obtuse triangle
Right triangle
Formula for circumference of a circle
Circumference = 2 x pi x radius
or
Circumference = pi x diameter
The interior angles of a pentagon total this many degrees
540 degrees
The measure of one interior angle of a regular hexagon
120 degrees