C. Solve the following problems:
21. A 20 cm by 16 cm picture was framed in a 25 cm by 18 cm colored cardboard. Find the area of the
colored cardboard that can be seen?
A. 120 cm?
8. 130 cm
C. 140 cm
0. 150 cm
22. A small square is located inside a bigger square. The length of one side of a small square is 5 cm and the
length of one side of a big square is 8 cm. What is the area of the region located outside the small
square but inside the big square?
A 89 cm?
8. 52 cm?
C. 39 cm
D. 12 cm
23. A rectangular field has a length of 20 meters and a width of 15 meters. It is surrounded with 2 meters
wide of cemented path. What is the area of the path?
A. 756 cm
B. 456 cm?
C. 300 cm?
D. 156 cm?
24. A triangle with a base of 9 dm and a height of 8 dm is to be cut from a thin cardboard 10 dm long and 9
dm wide. How much of the area of the cardboard will be left?
A. 54 cm?
B. 78 cm?
C. 90 cm
D. 162 cm
25. Arman helps Tomas to clean their circular play area whose diameter is 6 meters. What is the difference
between the area of the circular play area and the whole play area if it measures 15 meters by 10
meters?
A. 142.18 cm?
B. 121.74 cm
C. 63.48 cm
D. 36.96 cm​