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    The length AC is 12cm as the two triangles have all the same angles, the line AC corresponds to the line CE but AC is 2x larger so it is 2*6=12cm there is a much longer proof using the sine and cosine rules as well
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    15 and 45, 15 is not a factor of 1, 30 is the HCF of 30 and 60 so got to be C
 
 
 
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