Question

In tringle ABC LB 90, AB :BC = 3:4 then COSA:​

Answer 1

Answer:

CosA = 0.6

Step-by-step explanation:

given,

AB=3x

BC=4x

according to Pythagoras theorem,

${ac}^{2} = {ab}^{2} + {bc}^{2} \\ = {3}^{2} + {4}^{2} \\ = 9 + 16 \\ = 25 \\ ac = \sqrt{25} \\ = 5$

CosA= AB/AC

= 3/5

=0.6

Answer 2

this is your answer

hope it is useful