Imagine a rectangle with sides of $$14$$ and $$21 \ cm$$. Calculate the perimeter and area.
See development and solution
Development:
The perimeter is the sum of the sides: $$$P=2(14 +21)=70 \ cm$$$
The area of the rectangle is: $$$A=14\cdot21=294 \ cm^2$$$
Solution:
$$P=70 \ cm$$
$$A=294 \ cm^2$$