Question

show that the ABCis equilateral if A=x+30°B=3x-30°C=4x-60°

Answer 1

by adding all and equating it with 180 u will get x=30 now put values all will become 60 thus it is equilateral tri....

Answer 2

If it is a equilateral triangle,

All anlges should be of 60°

Then, in angle A

x+30=60
x=60-30=30

Then in Angkes B

3x-30=60
3x=60+30
3x=90
x=90/3 =30

Then in Angkes C

4x-60=60
4x=60+60
4x=120
x=120/4=30


As the x is same in all the equation and all have the sum of 60°, hence it is equalilateral triangle




I hope this will help you