I assume you are trying to show if this is true or false. You will have to use the cosine rule then the sine rule but to save yourself a bit of work think about whether the angle will be opposite the side with length 4 or 8.
hey there
regarding this problem
i know that i can use the cosine law and then the sine law to investigate whether the other ange must be 45 or not,,
but it takes alot of time and i kinda don't have that much time to solve a problem!!
i don't know if am overlooking other way of doing it??
I assume you are trying to show if this is true or false. You will have to use the cosine rule then the sine rule but to save yourself a bit of work think about whether the angle will be opposite the side with length 4 or 8.
I understand the problem like this:
one side = 4
adjacent side = 8
angle between them = 60 deg
this is a half equilateral triangle. One angle is 90 deg and the other is 30 deg. I think pi/4 in the original question is incorrect, or the given sided lengths are not 4 and 8. The triangle of the original question does not exist.