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Lesson 's Glossary: Acute
angle
An angle whose measure is greater than 0 but less than 90 degrees.
Acute triangle
A triangle whose angles are acute.
Cosine
Ratio determined by the hypotenuse in a right triangle and a side adjacent to a reference angle.
Equilateral triangle
A triangle whose sides are equal in length.
Isosceles triangle
A triangle with two sides of equal length.
Proportion
A statement that two ratios are equal
Proportional
One of four numbers that form a true proportion
Sine
Ratio of the length of the opposite side to a reference angle in a right triangle and the hypotenuse.
Opposite/hypotenuse.
Obtuse angle
An angle whose measure is greater than 90 but less than 180 degrees
Obtuse triangle
A triangle with one acute angle.
Ratio
A quotient of 2 numbers
Right triangle
A triangle that has a 90 degree angle.
Scalene triangle
A triangle with no equilateral sides.
Triangle
A polygon with three sides. |