Sine in a Right Triangle
trigonometry
Defines sine for an acute angle in a right triangle.
Math reference
Math Formula Reference
Search structured references across algebra, geometry, trigonometry, calculus, statistics, probability, number theory, and discrete math.
Formula catalog
Browse formulas
24 references found. Results are rendered on the server and limited to 25 per page.
Cosine in a Right Triangle
trigonometry
Defines cosine for an acute angle in a right triangle.
Tangent in a Right Triangle
trigonometry
Defines tangent for an acute angle in a right triangle.
Cosecant Identity
trigonometry
Defines cosecant as the reciprocal of sine.
Secant Identity
trigonometry
Defines secant as the reciprocal of cosine.
Cotangent Identity
trigonometry
Defines cotangent as the reciprocal of tangent.
Pythagorean Trigonometric Identity
trigonometry
Relates sine and cosine of the same angle.
Tangent Quotient Identity
trigonometry
Defines tangent as sine divided by cosine.
Complementary-Angle Sine Identity
trigonometry
Relates sine of a complement to cosine.
Complementary-Angle Cosine Identity
trigonometry
Relates cosine of a complement to sine.
Sine Addition Formula
trigonometry
Expands sine of a sum of angles.
Sine Subtraction Formula
trigonometry
Expands sine of a difference of angles.
Cosine Addition Formula
trigonometry
Expands cosine of a sum of angles.
Cosine Subtraction Formula
trigonometry
Expands cosine of a difference of angles.
Sine Double-Angle Formula
trigonometry
Expresses sine of twice an angle.
Cosine Double-Angle Formula
trigonometry
Expresses cosine of twice an angle.
Sine Half-Angle Formula
trigonometry
Relates sine of a half-angle to cosine.
Cosine Half-Angle Formula
trigonometry
Relates cosine of a half-angle to cosine.
Law of Sines
trigonometry
Relates side lengths and opposite angles in a triangle.
Law of Cosines
trigonometry
Relates sides and an included angle in any triangle.
Triangle Area Using Sine
trigonometry
Finds triangle area from two sides and their included angle.
Degree and Radian Conversion
trigonometry
Relates a half-turn in degrees and radians.
Arc Length in Radians
trigonometry
Finds arc length when θ is measured in radians.
Sector Area in Radians
trigonometry
Finds sector area when θ is measured in radians.