Answer: Reflection is the change in direction of a wavefront between two different media so that the wavefront returns into the medium from which it originated.
Step-by-step explanation:
This is a good example of a problem that is being used to trip you up! haha
Think it through like this.
Proportional to up is up and proportional to down is down.
Is the elevator going up? Yes
Is the time to get to a floor going up the higher it goes? Yes.
So the 750 feet means nothing in this problem.
The simple answer is yes.
Answer:
Step-by-step explanation:
The mnemonic SOH CAH TOA reminds you that ...
Sin = Opposite/Hypotenuse
In ΔAHD, the side opposite angle DAH is DH, and the hypotenuse is AD, so we have ...
sin(∠DAH) = DH/AD = 4/8
∠DAH = arcsin(4/8) = 30°
That makes ΔAHD a 30°-60°-90° triangle, so the side lengths have the ratios 1 : √3 : 2.
∠CAB = 2·30° = 60°, so ΔABC is also a 30°-60°-90° triangle having the same ratios of side lengths.
In short, ...
AH = √3·DH = 4√3
AC = 2·AH = 8√3
AB = 2·AC = 16√3
BC = √3·AC = 8·(√3)² = 24