Answer:
Step-by-step explanation:
a² + b² = c²
a² + 9² = 12²
a² + 81 = 144
a² = 63
a = √63
First one:
2.632 • 104 = 273.728
Second one:
2 • 10 - 7 = 13
If the line down the center is 8 and the diaameter is in the middle then both those sides need to be 8 and so the 6's on both sides of the diameter have to stay they same but they only change a little for 6+6 is 12 but the length gets longer since it moved farther down
answer D 12.5