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    When I'm doing questions like part d) I tend to sketch my diagrams like the one below yet the mark scheme has it different.

    As you can see this can be problematic as I'll end up using tan instead of sin to find the length of the side.

    Can someone explain how I would know which way to draw the diagram?

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    You would put B on l1 and then "draw" a perpendicular line going to l2 to find the shortest distance !
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    So basically your second diagram!
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    (Original post by Ravster)
    When I'm doing questions like part d) I tend to sketch my diagrams like the one below yet the mark scheme has it different.

    As you can see this can be problematic as I'll end up using tan instead of sin to find the length of the side.

    Can someone explain how I would know which way to draw the diagram?

    Name:  Screenshot_20160602-145833.jpg
Views: 32
Size:  310.3 KB
    Attachment 542121542123
    In your answer, the line going to l2 is not perpendicular to l2, which is why your answer is wrong.
 
 
 
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