Answer:

Step-by-step explanation:
1) the rule of transformation [degr → rad] is:
![\alpha [rad]=\alpha [degr] *\frac{\pi }{180};](https://tex.z-dn.net/?f=%5Calpha%20%5Brad%5D%3D%5Calpha%20%5Bdegr%5D%20%2A%5Cfrac%7B%5Cpi%20%7D%7B180%7D%3B)
2) according to the formula above:
230°=230*π/180=23π/18 [rad].
Answer:

Step-by-step explanation:
The equations are


Substituting the first equation in the second we get





So, the required values are 
Answer:
b
Step-by-step explanation:
90/110 reduces to 9/11. Good luck!