Mr Lanoie math slides

Mr Lanoie math slides
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  • New Friends
  • Whats up man my name is X
  • Thats a cool name my name is jerry 
  • SohCahToa my guy
  • You ever hear of SohCahToa my guy
  • nah whats a SohCahToa
  • Can you teach me?
  • To find out how tall that light post is we would use sohcahtoa
  • Can you teach me X
  • X is going to tech Jerry about SoCahToa and how to solve an equation about an everyday object having a trig equation in it 
  • How tall is the light?
  • Say I am ten ft away from the pole and i wanted to know how tall it was i know the angle i am at is 40 degrees also
  • SohCahToa is sin=opp/adj cos=adj/hyp and tan=opp/adj you would use these ratios to find a side length of a right triangle and only a right triangle 
  • Correct Jerry
  • You would use tan because you want to know how tall it is but you also know how far away you are
  • You would need to use sohcahtoa to find out the height and you would use tan=opp/adj. The other ratios would help you if it was a different situation but you can solve them the same way just use the sin or cos button on the calculator
  • How to solve it
  • You seem like you get it but let me ask you this, If i I wanted to know the hypotenous and i was given the adjacent what trig ratio would i use 
  • You would use tangent because the flag would be your opposite and the ten ft is your adjacent. You would write onto your peice of paper tan(40)=x/10
  • How do i know which part of sohcahtoah to use though
  • Your equation would look like this tan(40)=x/10. First you would isolate x and times both sides by 10 so now it would look like this 10tan(40)=x and now plug into your calculator 10tan(40) and your answer would be 8.391 for the height of the pole The slide to the left helps explain this. Once you calculate all the sides on the right triangle you can use it to find other angles in the triangle  
  • Exactly and if you knew the height and wanted to know how far you are you could switch them 
  • So I would do opposite over adjacent and plug in x for my adjacent
  • I just wanted to teach you another Trig ration to make sure he got it 
  • You would use sin because it would be opp/adj
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