Question

what does it mean to refer to a 20 inch tv set or a 25 in tv set? such units refer to the diagonalof the screen. a 25 in tv set also has a width of 2o inches
what is its height in inches

Answer 1

Hint: It's a right triangle. Where 25 is the hypotenuse and 20 is the vertical length.

Answer 2

i was asking how to figure it out but i need to see how its worked

Answer 3

Sure. Do you know the formula of a right triangle? (hint: do you know pythagorean's theorem?)

Answer 4

not sure this is a new chapter we are learning

Answer 5

did you hear about a squared plus b squared equals c squared?

Answer 6

thats the theorum

Answer 7

Good!
So what does each letter mean? the a,b,c?

Answer 8

(also, it's five am here, so I've gotta head to bed soon, please try to answer as quickly as possible)

Answer 9

are we not looking for c in the problem

Answer 10

I'm afraid not. A and B are 'legs', and C is the hypotenuse.

Answer 11

What are we missing? One of the two legs or the hypotenuse/

Answer 12

i would say the hypotenuse

Answer 13

Well, just to double check: do you know what a hypotenuse is?

Answer 14

the longest side of a right angle and the prolem is asking for the hieght

Answer 15

Perfect. And the longest side is opposite of the right angle (you'll have to trust me on this if you haven't learned this yet).

Answer 16

ok

Answer 17

So let's imagine this: your right angle is the bottom right corner of your screen. And our diagnol line will run from the top right (where the x on your screen is) to your start/windows button.

Answer 18

So far so good? so we have a long line running in this direction /

Answer 19

ok

Answer 20

sweet. So we know our diagnal is 25
and our width (where your start menu and clock are) is 20.

Answer 21

So, plug these numbers in for me into our formula.

Answer 22

(and also show me what your formula looks like after plugging it in)

Answer 23

ok

Answer 24

am i getting ahead or wouldnt both the height and width be squared\[25^{2} +20^{2 }\]

Answer 25

kinda.

Answer 26

c is our hypotenuse, right?

Answer 27

yes

Answer 28

and do we have a value for our hypotenuse? (remember the rule about hypotenuse being opposite of our right angle)

Answer 29

at the moment its not known

Answer 30

is it really?

Answer 31

its what we are trying to find

Answer 32

Remember that imaginary diagnal I had you draw through your monitor?

Answer 33

yes

Answer 34

was that not a hypotenuse?

Answer 35

i see your point

Answer 36

So how much is our hypotenuse, then? :P

Answer 37

Battery will die soon, so I'll go ahead and make an exception to my usual style of teaching and give you the formula:

Answer 38

25

Answer 39

\[20^2 + b^2 = 25^2\]

Answer 40

400 + b squared = 625

Answer 41

alright, gotta go. Subtract 400 from both sides and find out what squared = the new number. Good luck.

Answer 42

225

Answer 43

thanks

Answer 44

would it be 225 inches?

Answer 45

remember: B^2 (b squared) = 225
So how do you get B by itself?