Put your number into the half-angle formula and simplify.

The appropriate selection is ...

Answer:
(-5, -3)
Step-by-step explanation:
Scale factor 1/2 means divide points by 2
Answer:
the value is 100 times greater
Step-by-step explanation:
look at my comment below
20, 21, 29
Explanation:
Use the Pythagorean Theorem
20^2 + 21^2 = 29^2
400 + 441= 841
841 = 841