Answer:
Free points?!?
Step-by-step explanation:
Use pythagorean theorem for all of them
a. 3, 4, 5
3^2+4^2?5^2
9+16?25
25=25
right
b. 5, 6, 7
5^2+6^2=7^2
25+36=49
61>49
acute
c. 64+81=144
145>144
acute
hope this helps!
I'm going to take a guess that you are wanting to convert 6.25 radians to degrees. If I'm wrong, then ignore this! Use the fact that 1 radian = 57.2958°. Using the factor label method of conversion, we have

. The radian label cancels leaving us with degrees. 6.25*57.2958=358.09°