The angle of elevation of X from Y is 30o. If XY = 40m, how high is X above the level of Y?

The angle of elevation of X from Y is 30^o. If XY = 40m, how high is X above the level of Y?

A 10m
B 20m
C 20âˆš3m
D 40m
E 50m

waec 1989 mathematics

The correct answer is B. 20m

XZ = 40 x sin30^o

= 20m

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