# Mr Lanoie math slides

More Options: Make a Folding Card

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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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