Answer:
cos30=y/15
y= 15*cos(30)=15V3:2≈12?9903810..= 13 units of length
x:
15²=13²+x²
x²=15²-13²
x²=56
x=√56 =2√14≈7.483..=7.5 units of length
OR: cos60=x/15
x= 15*cos(60)= 7.5 units of length
right triangle:
tan60=x/15
x= 15*tan(60)≈25.98..=26 units of length
y²=15²+26²
y²=901
y=√901≈30.01666..=30 units of length
OR cos60=15/y
y= 15/cos(60)= 30 units of length