Answer:
[90,225] notation or 135 range
Step-by-step explanation:
10x9=90
25x9=225
[900,2250] notation or 1350 range
The law of cosines states that, if
is the angle between sides b and c,

So, plugging our values, we have

This is equal to

Answer:
C
Step-by-step explanation:
12^2 = 144, 9^2 = 81, and 15^2 = 225.
144 + 81 = 225, therefore a^2 + b^2 = c^2.