(NEED HELP PLS HELP) i really need help

What is sin 7x/4 ? i need on this urgent trig

Meghan has created a diagram of her city with her house, school, store, and gym identified. a. how far is it from the gym to the store? b. meghan also wants to walk to get some exercise, rather than going to the gym. she decides to walk along arc ab. how far will she walk? round to 3 decimal places.

I’m confused on how to work the pie charts