sin 90°
1
sin 90° is equal to 1.
In trigonometry, sin is short for sine. Sine is a trigonometric function of an angle, and it tells us the ratio of the length of the side opposite to the angle (in a right-angled triangle) divided by the hypotenuse (the longest side in the triangle).
In a right-angled triangle, the sine of an angle is always between -1 and 1, inclusive. The angle 90 degrees is special because it falls on the y-axis of the unit circle, where the value of sine is at its maximum (i.e., 1). Therefore, sin 90° = 1.
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