Question

a) In triangle ABC, B=90, A = x, C=2x
and AB=12cm, find BC.​

Answer 1

Answer:

the triangle is right angle triangle

 I \A

 I    \

 I 12   \

 I           \

BI______\C

ANGLE :

A=X,C=2X

SO,

X+2X=90

3X=90

X=30               a=30,c=60

so,

sin  

tan 60=p/b

         = 12/bc

      root 3= 12/bc

bc= 12/root 3

bc squar= 144/3

bc=root 48

aprox=6.9282