Answer:
a
Step-by-step explanation:
The diagonal is the hypotenuse of a right triangle with the width and length being the legs.
let l be the length
Using Pythagoras' identity in the right triangle , then
l² + 25² = 45²
l² + 625 = 2025 ( subtract 625 from both sides )
l² = 1400 ( take square root of both sides )
l = [tex]\sqrt{1400}[/tex] ≈ 37.4 cm ( to 3 significant figures )
The length is approximately 37.4 cm
