Question

C.
А
20 cm
y cm
с
10 cm
B
In AABC, right angled at B, ZACB = xº
Find:
i. cos xº
іі. x0
1
iii.
tan?x sin2x
iv. Use tan x to find the value of y.
1

Answer 1

Answer:

(1) cosx = base/hypotenuse

cosx = 10/20

cosx = 1/2

(2) cosx = 1/2

hence x= 60 degree

(3) tanx = √3 so tan square x = 3

sinx = √3/2 so sin square x = 3/4

so the final answer is -3.

(4) tan x = perpendicular/base

tan x = y/10

because x = 60

tan 60 = y/10

√3 = y/10

y = 10√3