The perimeter of triangle ABC is 90 degrees The triangle had side lengths AB=3x BC=4x, AC=5x. What is the value of x?

Question

I suck at math...please help?

Answer 1

Hi Cindy,

 

Perimeter can not be degrees. 

 

Perimeter is the sum of he side lengths. Then, 

3x + 4x + 5x = 90

12x = 90

x = 90/12

= 7.5 units

Answer 2

The perimeter of a triangle is the sum of its sides.

 

AB + BC + AC = Perimeter

 

3x + 4x + 5x = 90

 

 

Solve for x from this equation.