Trigonometry Ratios of 0°,30°,45°,60°,90°

 

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