Question

Find c if a = 7 and b = 9.
Right triangle with sides a, b, and c. Side c is opposite the right angle.
A. c = 16
B. c = 4
C. c = 3 times the square root of 7
D. c = the square root of130

Answer 1

Use the pythagoreon theroem!

Answer 2

Did you? What's up? Let's Math.

Answer 3

um like this

A^2 +B^2= C^2

Answer 4

You got it. You are given A and B. Let's do it. 7^2 + 9^2 = C^2.

Answer 5

49+81

Answer 6

@somebodys_heartbrake that's exactly the same question as the previous one except this one has different values.

And now you don't know square roots and squaring which should of been taught in primary/elementary school.

Answer 7

Sweet whats 49+81?

Answer 8

sweet? o.O

Answer 9

130

Answer 10

Alright so far we know that 130 = C^2. What's C???

Answer 11

@Azteck you are right infact i had replied in previos question and when i saw this i thought my reply got deleted :O .

Answer 12

I think it's a different question, but then it's just using the same format as the previous one.

Answer 13

Alright so far we know that C^2 = 130. Let's find C.
Do you know how to find square roots, or are you a little bit rusty?

Answer 14

idk sorry

Answer 15

Do you know the square root of say 9? Or do you know nothing about square roots?

I don't care either way so just be honest

Answer 16

\[\sqrt{9}\]

Answer 17

idk :/

Answer 18

haha alright :) Let's learn some square roots then. I'm not a math teacher but i'll try my best.

Answer 19

ok thanks for helping btw

Answer 20

So basically a square root is " What number multiplied by itself will give me this number"

Answer 21

@RandomFriend i appreciate your effort to help the asker get to the answer ..make sure you do not spoonfeed anyone in the process ,happy studying! :)

Answer 22

@AravindG Thanks! Happy internet moderating.

Answer 23

Anyway another way to look at square roots is "What number SQUARED, equals this number?" So lets look at \[\sqrt{4}\] . 2 squared . Aka 2*2 = 4

Answer 24

wouldnt it be 3 to the first 1 u asked

Answer 25

Yeah exactly. 3*3 = 9. So the square root of 9 is three.

Answer 26

ok

Answer 27

Alright it works with letters or "variables" too. What's the square root of \[\sqrt{x^2}\] ?

Answer 28

x?

Answer 29

Nice. X*X = X^2. How about something that applies to us. What is the \[\sqrt{C^2}\]

Answer 30

c

Answer 31

well done @somebodys_heartbrake and @RandomFriend :)

Answer 32

Nailed it. So we left off at \[C^2 = 130\].

What happens if we take the square root of both sides?

Answer 33

um not sure

Answer 34

Write it out for me. Put a square root symbol around both sides.

Answer 35

idk how to do that

Answer 36

......................

Answer 37

Alright so we are just going to draw a square root sign around both sides. You can do it. I'll do it first. \[\sqrt{C^2} = \sqrt{130}\]

Answer 38

@somebodys_heartbrake please make a thorough reading on this tutorial

http://www.mathsisfun.com/square-root.html

Answer 39

@somebodys_heartbrake wants to know how to write a square root sign like what @RandomFriend did above. I don't think @somebodys_heartbrake knows how to use the equation editor.

Answer 40

I dont care if you don't know how to use the equation thing. As long as you get it. Do you see how i got my equation above?

Answer 41

Alright I'ma move on. from here \[\sqrt{C^2} = C. \].

This givese us C = sqrt(130). Which was one of our answers I believe.