Question

if A+B=90degree, a:b=1:2 find sina:sinB

Answer 1

let A be x and B be 2x
therefore 3x=90
=>x=30

hence A=30° and B=60°
now Sin A=Sin30=1/2
Sin B=Sin60=√3/2
now SinA/SinB=(1/2)/(√3/2)=1/√3

hence SinA:SinB=1:√3