In a triangle counts: a : b = 3 : 4 and angle beta is 42 degrees-calculate the other angles

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calculate the angles

I am strugling with this one, wouldnt i need to know what triangle it is or can it be done with just these informations? greatfull for any help.

If it has a right angle i can just use trigonometry and do it but if im not sure it has a right angle what can i do?