what am I
what is length x width
area
this has a definite beginning and a definite send
line segment
i measure 180
straight angle
my area formula is 1/2 x base x height
triangle
sum of my angles
180
what is distance around a circle
circumference
this is represented by the ratio opposite/adjacent
tangent
we share a vertex but do not have adjacent sides
vertical angles
formula for area of a circle
pi x radius x radius
i have 2 congruent sides
isosceles
you use this when missing a side of a right triangle given two other sides
pythagorean thm
i measure greater than 90 but less than 180
obtuse angle
the sum of our measures are 90 degrees
complementary angles
you add the sides to get me
perimeter
i have no congruent sides
scalene
this polygon has seven sides
heptagon
i am the longest side of a right triangle
hypotenuse
we are lines that intersect to form right angles
perpendicular angles
if you 1/2 the diameter you get me
radius
the shortest side of any triangle is found where
across from the smallest angle
the last step in the pythagorean thm
square root
you use this on oblique triangles
law of sines
we are angles on the inside of parallel lines but alternating sides of transversal
alternate interior
my measure in a circle is the same as my arc
central angle
the way you find the angle measurement in trig is using this button
inverse