Question

In triunghiul ABC cu m(A)=90 de grade , cos B=0.75. Stiind ca :
a) AB 21 cm, aflati BC
b)BC=24cm ,aflati AB

Answer 1

cosB=AB/BC

a) 0.75=21/BC=> BC=21/0.75=2

8b) 0.75=AB/24=> AB=24*0.75 = 18