Itsyacoolgrl
  • Itsyacoolgrl
What is the length of AC?
Geometry
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Itsyacoolgrl
  • Itsyacoolgrl
What is the length of AC?
Geometry
katieb
  • katieb
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Itsyacoolgrl
  • Itsyacoolgrl
|dw:1434376010021:dw|
Epicteatime
  • Epicteatime
hmm
Epicteatime
  • Epicteatime
well this is hypothenuse I think

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Epicteatime
  • Epicteatime
10 is the longest side, so we add those 2 I think
Epicteatime
  • Epicteatime
oh wait, not add, subtract
MrNood
  • MrNood
you have 2 right angle triangles of which oyu know 2 sides Use Pythagoras to work out the 3rd side of each
MrNood
  • MrNood
@Epicteatime please stop there .. it is not adding or subtracting....
Epicteatime
  • Epicteatime
isn't it 6.61?
Epicteatime
  • Epicteatime
And yeah, it was Pythagoras xD sorry
Epicteatime
  • Epicteatime
Im doing hypotenuse in my Algebra class so I got it mixed up xD
Itsyacoolgrl
  • Itsyacoolgrl
No offense @Epicteatime , I appreciate your help but I would rather @MrNood help me
MrNood
  • MrNood
|dw:1434376275460:dw| use Pythagoras to find a and b then add them to get th eanswer
Itsyacoolgrl
  • Itsyacoolgrl
a^2 + b^2 = c^2 I can never figure out where I plug in the numbers though
MrNood
  • MrNood
c is always the longest side but don't confuse a and b in YOUR equation with those in my diag take each triangle: |dw:1434376491882:dw| |dw:1434376528838:dw|
Itsyacoolgrl
  • Itsyacoolgrl
So its a^2 + 6.5^2 = 7.5^2 in the first one and the second one is a^2 + 6.5^2 = 10?
MrNood
  • MrNood
yes (I assume you mean 10^2 in th second)
Itsyacoolgrl
  • Itsyacoolgrl
Yes :)
Itsyacoolgrl
  • Itsyacoolgrl
So then its a + 42.25 = 56.25 and a + 42.25 = 100
MrNood
  • MrNood
yes - so get the 2 different values for a - and add them together
MrNood
  • MrNood
sorry NO you have missed out the a SQUARED in your formula
Itsyacoolgrl
  • Itsyacoolgrl
ok, um what do I square?
Itsyacoolgrl
  • Itsyacoolgrl
....
MrNood
  • MrNood
So then its a^2 + 42.25 = 56.25 and a^2 + 42.25 = 100 so you need to solve for a^2 then take sqrt to find a
Itsyacoolgrl
  • Itsyacoolgrl
So do I subtract 42.25 from 56.25 and 42.25 from 100 and square the answer?
MrNood
  • MrNood
almost but you sqrt the answer (not square it)
MrNood
  • MrNood
a^2 + 42.25 = 56.25 a^2 = 56.25-42.25 a = sqrt(14)
Itsyacoolgrl
  • Itsyacoolgrl
sqrt(14) = 3.74
MrNood
  • MrNood
and do the same for the other equation a^2 + 42.25 = 100 a=?
Itsyacoolgrl
  • Itsyacoolgrl
57.75
MrNood
  • MrNood
no
Itsyacoolgrl
  • Itsyacoolgrl
isn't 100- 42.25= 57.75?
MrNood
  • MrNood
a^2 + 42.25 = 56.25 a^2 = 56.25-42.25 a = sqrt(14) use the same method....... a^2 + 42.25 = 100 a=?
Itsyacoolgrl
  • Itsyacoolgrl
a^2 + 42.25 = 100 a^2 = 100 - 42.25 a= sqrt (57.75)
Itsyacoolgrl
  • Itsyacoolgrl
a=7.59
MrNood
  • MrNood
ok - that's correct so now add the 2 separate values for a to get length AC
Itsyacoolgrl
  • Itsyacoolgrl
So 3.74 + 7.59 = 11.33
MrNood
  • MrNood
:-)
Itsyacoolgrl
  • Itsyacoolgrl
Thank you! :D

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