The length of the sides of the rectangle is 27cm and 300mm. Calculate the perimeter and area of this rectangle.

For the convenience of the calculation, we will convert millimeters to centimeters, remembering that one centimeter holds ten millimeters.
300 mm = 300/10 = 30 cm.
Next, we subtract the perimeter of the specified figure, designating it with a capital letter R. We are looking for the sum of all four sides of the specified figure:
P = 30 cm + 30 cm + 27 cm + 27 cm = 60 cm + 54 cm = 114 cm.
Second way to find the perimeter:
P = 30 cm * 2 + 27 cm * 2 = 114 cm.
Now we find out the area of the rectangle by multiplying its length by width:
S = 30 cm * 27 cm = 810 cm2.