Trigonometric radio.

Findthe unknown.
corr to 3 sign. fig. if necessary.

(a)
sin35° =y/10
y = 10 sin35°
y = 5.74 (to 3 sig. fig.)

(b)
cos30° = x/(15/2)
x = (15/2) cos30°
x = 6.50 (to 3 sig. fig.)

(c)
sinθ = 9/12
θ = 48.6° (to 3 sig. fig.)


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Find the value of each of the following expression.
Correct to 3 sig. fig.

(a)
3 sin33° +5 sin57°
= 5.83 (to 3 sig. fig.)

(b)
(sin54°/sin27°)x sin50°
= 1.37 (to 3 sig. fig.)


=====
Find θ corr to 1 decimal place.

(a)
cosθ =0.8394
θ = 32.9° (to 1 decimalplace)

(b)
cosθ =4/11
θ = 68.7° (to 1 decimal place)

first 3 photos, left to right,
1. 5.74 2. 6.70 3. 48.6

down (left)
a) 5.83
b) 1.37

down(right)
a) 32.9
b) 68.7