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    Please help
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    (Original post by randomuser5678)
    Please help
    D
    the triangles are similar shapes
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    (Original post by IDOZ)
    D
    the triangles are similar shapes
    Thankyou
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    (Original post by randomuser5678)
    Thankyou
    Measure angles BAC and CED
    if they are the same, then it is D
    if not, then it is A
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    If you examine the triangles and the length DE and AB you'll notice they're similar, by a scale factor of 2, so you can get your value of AC by doubling your value of CE, which is 12cm.
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    How would i work it out?
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    (Original post by randomuser5678)
    How would i work it out?
    A highest common factor means that the number stated in the question (15) is the greatest possible number that goes into the ones you are looking at. For example, the greatest common factor of 12 and 16 is 4, because any number higher than 4 will not fit into both numbers.

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    C since the HCF of 30 and 60 is 30
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