ill in the blanks to solve the diagonal AB

you would first use ___ on the bottom of the box rectangle to find the diagonal CB=___
Then use CB as ___ of the triangle ACB, with AB being the ___
AB is approximately=___
the options:
73 cm
3 cm
5 cm
Area of a Rectangle
Pythagorean Theorem
89 cm
Perimeter of a rectangle
Square root of 7
13 cm
hypotenuse
a leg

you would first use Area of a Rectangle on the bottom of the box rectangle to find the diagonal CB=5 cm

Then use CB as the hypotenuse of the triangle ACB, with AB being the leg
AB is approximately=73 cm