Measure the length of the rectangle
Measure the width of the rectangle
Square the length
Square the width
Add the two squares
Take the square root of the sum
Use the formula: diagonal = √(length² + width²)
Measure the length of the rectangle
Measure the width of the rectangle
Square the length
Square the width
Add the two squares
Take the square root of the sum
Use the formula: diagonal = √(length² + width²)