Answer:
Hey buddy
Using pythagoras theorem for this question is the easiest and fastest method. Using sin or cosine rule will complicate it and it requires atleat one angle value to be quoted. So try to use the method in which I have solved this for you.
A. True (APEX)
Very late but hope it helps
Step-by-step explanation:
x = 36
y = 48
z = 72
hope it helps
Part B seems to be missing, but I think I have enough information to be able to answer.
Let's say we had two numbers x and y. Let x be rational and y be irrational.
If x is some nonzero number, then x*y is irrational. The proof for this is a bit lengthy so I'll leave it out.
For instance,
x = 2 is rational, y = sqrt(3) is irrational, x*y = 2*sqrt(3) is irrational.
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If we made x = 0, then
x*y = 0*y = 0
This is true for any value of y that we want. The y value doesnt even have to be irrational. It can be any real number.
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So the distinction is that if x = 0, then x*y = 0 is rational since 0 is rational. Otherwise, x*y is irrational.