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Calculate Angle


Calculate the angle of a triangle


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Adjacent side Opposite side Hypotenuse Angle α

Calculate angle using sine, cosine, and tangent


Measuring and understanding angles is an important part of mathematics, and the sine (sin), cosine (cos), and tangent (tan) are three functions that help us do this. They are called trigonometric functions and are often used in solving problems in geometry and physics. Let's see how we can use these functions to calculate the size of an angle in a right triangle.

First of all, in a right triangle, we have three sides: the opposite side (opposite the angle we want to find), the adjacent side (next to the angle we want to find and opposite the right angle), and the hypotenuse (the longest side opposite the right angle). These sides play a crucial role when using sin, cos, and tan.

Sine (sin)

The sine of an angle in a right triangle is the ratio of the length of the opposite side to the length of the hypotenuse. So, to find the angle, we take the arcsine (also called the inverse sine) of the ratio between the opposite side and the hypotenuse.


sin(θ) = opposite side / hypotenuse

Cosine (cos)

The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse. So, to find the angle, we take the arccosine (also called the inverse cosine) of the ratio between the adjacent side and the hypotenuse.


cos(θ) = adjacent side / hypotenuse

Tangent (tan)

The tangent of an angle in a right triangle is the ratio of the length of the opposite side to the length of the adjacent side. So, to find the angle, we take the arctangent (also called the inverse tangent) of the ratio between the opposite side and the adjacent side.


tan(θ) = opposite side / adjacent side

It's important to note that these functions give us the angle in radians, and to convert it to degrees, we multiply the result by 180/π.

By understanding and applying the sin, cos, and tan, we can solve complex problems and gain deeper insight into the world around us, from building buildings to launching satellites. They are powerful tools in mathematics and science and are part of the foundation of much advanced research and discovery.







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