Sine and cosine theorem refers to sine theorem and cosine theorem, which is an important theorem to reveal the relationship between angles of triangle. It can be directly used to solve the triangle problem. Sine theorem is to solve a triangle by knowing two angles and one side of the triangle, or the angle opposite to two sides and one side of the triangle.
cosine theorem
Cosine theorem, the basic theorem of Euclidean plane geometry. Cosine theorem is a mathematical theorem describing the relationship between the length of three sides in a triangle and the cosine value of an angle. It is a generalization of Pythagorean theorem in general triangles, and Pythagorean theorem is a special case of cosine theorem.
Cosine theorem is an important theorem to reveal the relationship between the angles of a triangle, which can be directly used to solve the problem of solving the third side of a triangle with known two sides and included angles.
Cosine theorem is an important theorem in solving triangles, which can be applied to the following three requirements: if two sides of a triangle and their included angles are known, the opposite sides of the known angles can be obtained from cosine theorem. When the three sides of a triangle are known, the cosine theorem can be used to find the three internal angles of the triangle. When the three sides of a triangle are known, the area of the triangle can be calculated by cosine theorem.
sine law
(1) Know two angles and one edge of a triangle and solve the triangle.
(2) Know the angles of two sides of a triangle and one of them, and solve the triangle.
(3) Use A: B: C = Sina: Sinb: Sinc to solve the transformation relationship between angles.
The ratio of the opposite side of the acute angle of a right triangle to the hypotenuse is called the sine of this angle.