Lesson 21 Expressions and equations
Four rods of un known length a were used to make the perimeter of a square,
with an extra 2 foot length on each side.
Write an expression for the perimeter of the square.
Two of the same rods were used to make the perimeter of this rectangle.
Write an expression for the perimeter of the rectangle.
The perimeter of the square and the perimeter of the rectangle are
exactly the same length.
Construct and solve an equation to find the length of the rod a.