Resposta:
Explicação passo-a-passo:
a)cos30°=16/x b)26/sen90°=13sen y c)sen60°=w/18
26/1=13/sen y √3/2=w/18
√3/2=16/x 26*sen y=13 2*w=18*√3
x*√3=2*16 sen y=13/26 w=18√3/2
x=32/√3 sen y=1/2 w=9√3
x=32√3/3 y=30°
d)cos45°=20/z
√2/2=20/z
z*√2=2*20
z=40/√2
z=40√2/2
z=20√2
