Yes
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vertical signs generally give instructions or tell you the law. horizontal signs give directions or information
It is just the law of arithmatic. If you have one dog, then you get a second dog, you have two dogs. Nature Girl
11.6
Yes. Light follows the law of signs and Sin(I)/vi = Sin(R)/vr . Because vi=vr the angles are equal. This important law in physics is often stated as follows: Angle of Reflection = Angle of Incidence
The formula is a/sinA=b/sinB=c/sinC. The idea behind the equation is that the larger an angle is the larger the side across from it will be and the smaller the angle the smaller the side across from it will be.