Answer:
Step-by-step explanation:
See attached image
Answer:
D
Step-by-step explanation:
The equation of a circle centred at the origin is
x² + y² = r² ( where r is the radius )
Here r = 15, thus
x² + y² = 15² , that is
x² + y² = 225 → D
Answer:
21
Step-by-step explanation:
I dunno, I used a calculator B)
Answer:
80 degrees.
Step-by-step explanation: