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In 'triangle A B C, /\ A=75^circ, /\ C=6...

In 'triangle A B C, /_\ A=75^circ, /_\ C=60^circ'
'(##VPU_TTT_MAT_X_P01_C05_E14_005_Q01##)'
a) What is the measure of '/_\ B ?'
b) If 'AB=5, sqrt2', what is the length of 'AC' ?
c) Find the ratio of 'AB: BC: AC'.

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