Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 5 - No. 10)
If you know the height of a building and the angle of elevation to its top, which trigonometric function should you use to find the distance from you to the building?
Sine
Cosine
Tangent
Cosecant
Giải thích
Tangent(angle) = height/distance. Therefore, if you know the angle and height, you use the tangent to find the distance.