SOLUTION: The length of a side of an equilateral triangle is represented by 2x-1. If the perimeter of the triangle is 21, what is the value of x ?
Algebra.Com
Question 817063: The length of a side of an equilateral triangle is represented by 2x-1. If the perimeter of the triangle is 21, what is the value of x ?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
All sides are equal
perimeter = 3(2x-1)
3(2x-1)=21
2x-1= 21/3
2x-1=7
2x=7+1
2x=8
x=8/2
x=4
RELATED QUESTIONS
The length of a side of a square is represented by x+2 and the length of a side of an... (answered by josgarithmetic)
If the perimeter of an equilateral triangle is represented by 6x − 9, the length of (answered by rapaljer)
an equilateral triangle has a perimeter of 12. what is the length of each... (answered by Alan3354)
An equilateral triangle has a perimeter of 6x+15. What is the length of each side of the... (answered by rfer)
The perimeter of an equilateral triangle is 96 centimetres.
What is the length of one... (answered by jim_thompson5910)
The perimeter of an equilateral triangle is 60 meter, what is the length of its... (answered by Alan3354)
If the altitude of an equilateral triangle is 5cm, what is the length of a... (answered by cleomenius)
What is the side length of an equilateral triangle with perimeter of 36/2/3in
(answered by tommyt3rd)
the perimeter of an equilateral triangle is 21.33 cm what is s the length of each side of (answered by ikleyn)