Let x be the length of the first side and y be the length of the second side.
We are given that x + y = 15, and the perimeter of the triangle is 21, which means x + y + z = 21, where z is the length of the third side.
To find z, we can subtract x and y from both sides of the equation:
z = 21 - (x + y)
Substituting the value of x + y from the first equation, we get:
z = 21 - 15
Simplifying the expression, we find:
z = 6
Therefore, the length of the third side of the triangle is 6 inches.
Fins the length of the third side of a triangle with a perimeter of 21 in. if the sum of the other two is 15 in.
Set up and equation and solve
1 answer
1 answer