Polygons
eight sided polygon
octagon
a triangle that has three equal sides
equilateral triangle
90 degrees
right angle
flat surface that extends infinitely in all directions
plane
35 degrees 65 degrees 80 degrees
acute triangle
polygon with six sides
a triangle that has three equal acute angles
equilangular triangles
name of angle with a measurement of 89 degrees
acute angle
a triangle cannot be formed if the sum of the given angles is more than 180 degrees. True or False?
True
instrument use to measure angles
protractor
quadrilateral with all 4 sides equal length, opposite angles are equal, adjacent angles are supplementary
rhombus
a triangle that has one right angle
right triangle
two angles whose sum is 180 degrees
supplementary
When the sum of the two shorter given sides is greater than the longest given side a triangle can be formed. True or False
True
what unit is used to measure angles
degrees
two polygons that have the same shape and size
congruent
angles of a triangle measure 45 degrees, 120 degrees and 15 degrees. Name the type
obtuse
angle whose sum is greater than 180 degrees
reflex
What are two polygons called if they have the same shape but are different sizes?
Congruent
the side or angle that is between two other given measures when the triangle is drawn.
included triangle
If the width of one side of a rectangle is 4 ft, and the length is 9 ft, what is the perimeter?
26 ft
sides of a triangle are 3ft, 15 ft and 13 ft measure of a triangle. Name the type of triangle
scalene
angle with a measure of 180 degrees
straight line
If two angles share a common ray between them, what are they called?
Adjacent angles
For two angles to be adjacent what must the two angles share besides a common side between them
common vertex