Respuesta :

 60 + 30 + 90 + x +12+= 180
 192 +x = 180
x= 12

gustanika
You should use sin ratio to find the value of x
sin an angle = side adjacent to the angle / hypotenuse

So from the question, we should solve it like this,
cos 60° = x/12
x/12 = cos 60°
x/12 = 1/2
x = 1/2 × 12
x = 6

The value of x is 6, no need to use radical equation because there's no radical

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