#Can someone explain why my answer is wrong.

23 messages · Page 1 of 1 (latest)

spare acorn
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I think the easiest way of doing this would be drawing a sin graph

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Cuz from the graph you can see sin180 = 0 and then to get from 180 to 240 you need 60 and from the graph its negative so you get -sin60

shut edge
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yeah but i need to cover CAST dont i? 😭

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like, what if an exam question comes up and it asks me to use CAST to answer it

spare acorn
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With CAST i'm pretty sure you measure the angle from the horizontal line

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You measured 30 from the vertical line

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But its 60 from the horizontal line

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And cuz its the bottom right quadrant sin is negative

shut edge
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ohhh

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and the reason why its not positive sin is cuz only tan is positive in the third quadrant?

spare acorn
shut edge
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oh thank u lol

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damn u learn this stuff at GCSE?

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i didnt learn this at GCSE damn- 😭

spare acorn
shut edge
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omg how

spare acorn
shut edge
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oh ok

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thanks lad

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so with CAST, i ALWAYS measure from the horizontal line and never from the vertical?

spare acorn
shut edge
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oh ok

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thank u sm i get it a lot more now