Sum of a polygon - ANSWER-(n-2)180
Right angle - ANSWER-90 degrees
acute angle - ANSWER-less than 90 degrees
obtuse angle - ANSWER-greater than
... [Show More] 90 degrees and less than 180 degrees
reflex angle - ANSWER-greater than 180 degrees
complementary angles - ANSWER-Two angles whose sum is 90 degrees
supplementary angles - ANSWER-Two angles whose sum is 180 degrees
interior angles of a polygon - ANSWER-angles inside of a polygon
triangle - ANSWER-A polygon with three sides whose interior angles equal 180.
isosceles triangle - ANSWER-A triangle that has 2 equal sides.
equilateral triangle - ANSWER-a triangle with 3 equal sides (60 degrees)
Triangle Inequality Theorem - ANSWER-The sum of the lengths of any two sides of a triangle must be greater than the length of the third side
scalene triangle - ANSWER-no equal sides
quadrilateral - ANSWER-a four-sided polygon with interior angles adding to 360 degrees
Parallelogram - ANSWER-A quadrilateral with two pairs of parallel sides
square - ANSWER-A quadrilateral with 4 sides that are equal and has all 90 degree angles
rectangle - ANSWER-a parallelogram with 4 right angles
Rhombus - ANSWER-A parallelogram with four congruent sides.
Trapezoid - ANSWER-A quadrilateral with exactly one pair of parallel sides
isosceles trapezoid - ANSWER-a trapezoid whose nonparallel opposite sides are congruent
kite - ANSWER-a quadrilateral with two pairs of adjacent sides congruent and no opposite sides congruent
Hypotenuse - ANSWER-the side of a right triangle opposite the right angle
legs of a right triangle - ANSWER-the sides adjacent to the right angle
Pythagorean Theorem - ANSWER-a²+b²=c²
acute angle on a right triangle - ANSWER-90 degrees
circle - ANSWER-The set of all points in a plane that are the same distance from a given point called the center
diameter - ANSWER-the distance across a circle through its center
Radius - ANSWER-The distance from the center of a circle to any point on the circle
Tangent - ANSWER-A line in the plane of a circle that intersects the circle in exactly one point.
circumference - ANSWER-The distance around a circle
Circumference of a circle - ANSWER-C=2πr or C=πd
area - ANSWER-The space inside the shape
Area of a circle - ANSWER-A=πr²
Arcs - ANSWER-a part of the circumference of a circle.
sector - ANSWER-The part of a circle that looks like a piece of pie. A sector is bounded by 2 radii and an arc of the circle.
Solving for angles and arcs - ANSWER-Central angle/360•=arc length/2πr= area
of sector/πr²
central angle - ANSWER-Vertices are on the center of the circle
inscribed angle - ANSWER-an angle whose vertex is on the circle [Show Less]