http://www.outdoorlanternsonsale.com/focus-flashlight/
trigo..help..!?
A flashlight was focused on the mirror forming an angle of 80°. The length of the light from the flashlight to the mirror was 8 m and the length of the reflected light to the wall was 7 m. find the distance from the flashlight to the end of the reflected light.
use the law of sines or cosines.
Hi There =)
If you draw a diagram, you will see that you have 2 known side lengths and the contained angle. Use the cosine law.
a² = b² + c² - 2bc cos A
b = 8
c = 7
A = 80°
a² = 8² + 7² - 2(7)(8) cos 80
a = 9.67 m
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