To find a missing side, the angle and sides are substituted close substitute In algebra substitute means to replace a letter (or variable) with a number. into one of the trigonometric equations above.

As two of the sides are equal, the base angles are equal sizes. ... Work out the value of the angle 𝒅 by solving the equation 𝒅 + 200 = 360, 360 – 200 = 160.

Trigonometry is a branch of mathematics that studies relationships between the sides and angles of triangles. Skip to main content. Open menu ... Mathematics: Facts about counting, equations, ...