Find x if the perimeter is 27cm
Equilateral triangle
Bottom of the triangle 1.3x-4
To find the perimeter of an equilateral triangle, we can use the formula P = 3s, where P is the perimeter and s is the length of one side of the equilateral triangle.
In this case, since the bottom of the triangle is 1.3x - 4, that is one side of the equilateral triangle. So, we can set up the equation:
3(1.3x - 4) = 27
Simplify the equation:
3.9x - 12 = 27
Add 12 to both sides:
3.9x = 39
Divide by 3.9 on both sides:
x = 10
Therefore, x = 10.