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Mathematics 8 Online
lilcutie2:

help

lilcutie2:

@lucasp16

HaydenwH:

are you using like pythagorean theorem?

lilcutie2:

I don't think so

HaydenwH:

your tryin to find the hypotenuse?

lilcutie2:

I'm trying to find the length of rq

HaydenwH:

ok one sec and ill give you a formula

lilcutie2:

\(\color{#0cbb34}{\text{Originally Posted by}}\) @HaydenwH ok one sec and ill give you a formula \(\color{#0cbb34}{\text{End of Quote}}\) ok thanks

AZ:

|dw:1614868808883:dw|

lilcutie2:

what's the formula again

snowflake0531:

no formula, create a proportion

AZ:

How do we write the proportion? We have to choose the same side on both triangles so AB and PQ so for AC, what should the other side be?|dw:1614868883400:dw|

lilcutie2:

pr

snowflake0531:

\(\color{#0cbb34}{\text{Originally Posted by}}\) @lilcutie2 pr \(\color{#0cbb34}{\text{End of Quote}}\) better to do RP-

AZ:

yes good! so can you write it as a fraction

AZ:

AB is 20 PQ is 12 AC is ?? PR is 6 so we have to write two ratios and set them equal AB/ PQ = AC/ PR

AZ:

\(\dfrac{AB}{PQ} = \dfrac{AC}{PR}\) can you put in the numbers?

lilcutie2:

20/12=ac/6

lilcutie2:

or do I use a different variable

AZ:

Good!

snowflake0531:

AC is fine, but x would be easier since it's one letter lol

AZ:

solve for it now :)

lilcutie2:

so 20/12= 1.66 times 6 =9.96 or did I do that wrong

AZ:

mhmm let's not divide the fraction do what you were doing before and cross-multiplying

snowflake0531:

*first simplify

snowflake0531:

makes it easier 20/12 -> 5/3

lilcutie2:

120

lilcutie2:

IDK 30

AZ:

remember \(\dfrac{a}{b} = \dfrac{c}{d}\) is the same thing as \( ad = bc\)

AZ:

so \(\dfrac{20}{12} = \dfrac{AC}{6}\) so we get \( 12 \times AC = 20 \times 6\)

AZ:

does that make sense?

snowflake0531:

lol, yes ^^^^ that, for the a hundredth time i write it wrong-

lilcutie2:

20*6=30

AZ:

try again what is 20 times 6

lilcutie2:

\(\color{#0cbb34}{\text{Originally Posted by}}\) @AZ try again what is 20 times 6 \(\color{#0cbb34}{\text{End of Quote}}\) 120 I'm sorry

AZ:

good now divide by 12

lilcutie2:

10

AZ:

and that's your answer! Cheers

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