1- sin 43= x/12
x= 12 ×sin 43 = 8.18 m

cos 43 = x/ 12
x = 12 ×cos 43 = 8.77 m


2- tan 30= 10/x
x= 17.3
tan 10/y
y= 10

17.3 - 10 = 7.3 m



3- x+27+ 5x+- 17 =90
6x + 10 = 90
6x= 90-10
6x= 80
x= 80/6
= 40/3