You can use trigonometry such as cos and tan
tan(52 deg) = 1.2799, approx.
Opposite side over Adjacent side, or sine/cosine
The area of Binh Tan District is 52 square kilometers.
The six basic functions of trigonometry are the sine, cosine, tangent, cosecant, secant, and cotangent functions. Abbreviated sin, cos, tan, csc, sec, cot.
tangent of 30 degrees = 1/2 of the square root of 3 = roughly 0.5773
angle can be defined as sin-1=O/H, cos-1=/H, or Tan-1=O/A
A useful property in Trigonometry is: tan(x) = sin(x) / cos(x) So, cos(x) tan(x) = cos(x) [ sin(x) / cos (x)] = sin(x)
A way to remember the definitions of the three most common trigonometry functions: sin, cos and tan. Used as a memory aid for the definitions of the three common trigonometry functions sine, cosine and tangent.
sin^2 (feta) + cos^2 (feta) = 1 sin (feta) / cos (feta) = tan (feta)
plane trigonometry spherical trigonometry
The inverse of sine (sin) is cosecant (csc). The inverse of cosine (cos) is secant (sec). The inverse of tangent (tan) is cotangent (cot).