Page 133 - NUMINO Challenge_C1

Type 15-1 Using Sticks to Make a Rectangle

Nine sticks of different lengths are shown below. Find the greatest area
of the rectangle that can be formed by using these sticks.

1 cm
2 cm
3 cm
4 cm
5 cm
6 cm
7 cm
8 cm
9 cm

1 The perimeter must be an even number because of {(width) (length)} 2.
Which stick should you leave out?

2 As the difference between the width and the length becomes smaller, the
area of a rectangle with a fixed perimeter becomes greater. How long
should the width and the length be?

3 Draw the rectangle using the width and the length found in 2 .

9cm

4 What is the greatest area of the rectangle that can be formed by using the
sticks?

130 NUMINO Challenge C1