Yeah you are. You can’t use electricity without it.
Nah, I hired an electrician to handle all that for me. Now if I want electricity all I have to do is stick a plug in a socket, or flip a switch. It’s way more convenient.
If the power into your house is off from 60Hz (or 50 depending on your region), an electrician isn’t going to do diddly.
How could it be off frequecy at house level? Aren’t the generators at the powerplants being spun at 50 or 60 times a second?
I don’t think I’ve ever used them.
Your phone relies on trigonometry.
I use trig every few years when buying a tv. Tv specs always list diagonal but rarely horizontal and vertical which is needed for knowing how a TV will fit in a space.
I’m trying to figure out how you need trig for that. Just the Pythagorean theorem and ratios seem sufficient to me.
Ratios can be used in trig – if it’s 1.5 times as long as it is tall, tan(\theta) = \frac{2}{3}, which then allows you to find the lengths of the other two sides easily so long as you have a calculator.
Right, but why bring theta into it at all? TV screens are as a hypotenuse (a²+b²) with a fixed ratio (a/b=16/9), so you just need to solve for a and b.
I mean unless you’re able to do it in your head in less than a minute, bringing a tape measure would probably be faster and easier.
