Question

Geo Help!

Answer 1

B!

Answer 2

Its not B so now I know you're guessing :P

Answer 3

@Chris911

Answer 4

No i am not! never accuse me of lying :) it was worth a try though!

Answer 5

I checked the answer, its not B.. how would you get B?

Answer 6

do you know about pythagorean theorem ?
a^2 + b^2 = c^2

for a right triangle

Answer 7

not much. could you show me how to do it?

Answer 8

First step, what are the lengths of the 2 "legs" of the triangle ?

Answer 9

3 and 6?

Answer 10

yes. the little red mark means that side is the same as the other line with a little red mark... i.e. it has length 6

we call the legs a and b in the formula
a^2 + b^2 = c^2

replace the letters with the numbers (which is a or b does not matter)

what do you get ?

Answer 11

36+9=45?

Answer 12

yes now square root that

Answer 13

yes. c^2 = 45

and btw, c is what we name the hypotenuse in the right triangle.
in your problem x is the hypotenuse.

so far, you know x^2= 45

Answer 14

9sqrt5

Answer 15

no

Answer 16

3sqrt5

Answer 17

to simplify sqr(45) write it as sqr(9*5) or sqr(3*3*5)
now take out "pairs" from the square root.

Answer 18

cause 9 times 5 and then the three goes outside :P

Answer 19

btw, there is a "trick" you can use to make the arithmetic easier.

the legs are 3 and 6. we can "factor out a 3" to get 1 and 2
now use 1 and 2 in the pythagorean theorem
1^2 + 2^2 = c^2
1+4= c^2
5 = c^2
and c= sqr(5)
then (because we factored out a 3) "fix the answer" by multiplying by the 3
to get
3 sqr(5)

Answer 20

thanks phi

Answer 21

If that is confusing, you don't need to know it. But if you can make sense of it. it is a good trick to learn

Answer 22

so I was right C 3sqrt5

Answer 23

yup C is right! thank you both so much for the help!