Let
be the length of the leg with one tick mark and
the length of the leg with two tick marks.
In the upper triangle, the law of cosines says

In the lower triangle, it says

Subtract the second equation from the first to eliminate
:


and
are lengths so they must both be positive. 10 is also positive, so in order to preserve the sign on both sides of this equation, we must have


Now we have to be a bit careful. If
is an acute angle, then as
gets larger, the value of
gets smaller. So if we have two angles
and
, with
, then we would have
.
This means in our inequality, taking the inverse cosine of both sides would reverse the inequality:

We know that
is an angle in a triangle, so it must be some positive measure:

So we must have

Brands of cereal is Ratio
32 + 64 = 96. So 96 should be your answer 4 +2 equals 6 and 3 + 6 = 9.
Answer:
90°
Step-by-step explanation:
