Answer:
6
Step-by-step explanation:
If two angles are equal, then the two angles are obtuse.
We have the sum of cubes identity

and observing that 1 + 4 = 2 + 3, we have

and

Then

Alternatively, we have the well-known sum of cubes formula

The sum under the square root is this sum with
. Then

and so the square root again reduces to 15.
Answer:
3 1/2cm
Step-by-step explanation: