Page 187 - NUMINO TB_4B

1 . 1 in. Activity 3 P. 68~69
1 in.

9 in.2 Rectangle Length(in2) Width(in2) Perimeter(in2) Area(in2)

16 in.2 24 in.2 1 24 1 50 24
2 12 2 28 24
21 in.2 25 in.2 38 3 22 24
46 4 20 24

The rectangle with the greatest area. The area of all the rectangles is the same, but
the perimeters are different.
2 . When the perimeter of a rectangle is given, a
The rectangle with the greatest perimeter is the
square shape would create the greatest one with the longest length.
possible area. A square has 4 equal sides.
If the given perimeter is 24 inches, the side 1.
length of the square would be 6 inches. The greatest perimeter: 34 units
The area of this square would be 36 square
inches.

20 units 16 units

Activity 2 P. 66~67

1 . Sample Answers 2 . The 3 rectangles below each has an area of

Area of 8 sq units

18 square units.

18 units 18 units 9 units 6 units
18 units
1 units 2 units

3 units

18 units The rectangles have the perimeters of
38 units, 22 units, and 18 units.
Area of 12 sq units
Therefore, the rectangle with the width of
26 units 1 unit and the length of 18 units has the

greatest perimeter.

Challenge P. 70~71
1.

26 units 26 units

Area of 14 sq units

30 units
30 units

30 units

176