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Square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.
Pythagorean theorem
Equal to the ratio of the adjacent side to an acute angle to the hypotenuse. (In a right triangle)
Cosine
The longest side of a right triangle, opposite the right angle.
Hypotenuse
Line forming the boundary of a closed geometric shape.
Perimeter
Ratio of the opposite side of a given angle to the hypotenuse. (In a right triangle)
Sine
A straight line from the center to the circumference of a circle.
Radius
A unit of measurement of angles.
Degree
Triangle that has two sides of equal length.
Isosceles
Ratio of the opposite side of a given angle to the adjacent side. (In a right triangle)
Tangent
Figure with three straight sides and three angles.
Triangle
Triangle that has an angle with more than 90º
Obtuse triangle
A triangle that all of its tree sides are equal.
Equilateral
The extent or measurement of a surface.
Area
A triangle that has 3 angles with less than 90º.
Acute triangle
