Why can we use trigonometric functions to describe periodic behavior, even when the behavior does not involve angles measured in radians or degrees?

Acylinder has volume 45π and radius 3. what is it’s height?

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

What is the y-intercept of the line given by the equation