Trigonometric Ratios of 45°
In Triangle ABC, right-angled at B
if one of the angles is 45°, then the other angle is also 45°
(The sum of the angles in a triangle is 180°. One angle is 90°, another angle is 45°, then the third angle is 45°.)
so, Angle B = 90°
Angle A = Angle C = 45°
Trigonometry Ratio Table
