The formulas for the perimeter and area of a square may be derived from the corresponding formulas for a rectangle because, like rectangles, squares are quadrilaterals, therefore sharing the same formal characteristics as a rectangle. They both contain a pair of lengths and a pair of widths, giving us 2-dimensional figures on a plane.
Here is one way to do it. See the attached image.
Answer:
315
Step-by-step explanation:
45/60 = 3/4
3/4 * 420 = 315
Answer:

Step-by-step explanation:
Get rid of the parenthesis then combine like terms