Page 231 - New Medley 5 Semester 1

PUZZLE • Critical Thinking

A. Find the area of the adjoining shape by dividing 16 cm
5 cm
it into squares/rectangles.

Think about the area of the given figure. 10 cm
5 cm
We divide the figure into a square of side 10 cm
and a rectangle of dimensions 6 cm by 5 cm as
10 cm
shown below.
10 cm 6 cm
Area of the square I = 10 cm × 10 cm
II 5 cm
= 100 sq. m
5 cm
I
5 cm6 cm
and area of the rectangle II = 6 cm × 5 cm
10 cm
= 30 sq. cm
10 cm
Thus, area of the given figure = 100 sq. cm + 30 sq. cm = 130 sq. cm

Now, find the perimeter and area of the following shapes by dividing them
into convenient rectangles and squares.

1. 2.5 m 2. 20 cm
1.5 m 1.5 m 15 cm
2.5 m 2 m 30 cm

6 m
4 m 40 cm 35 cm

4 m 40 cm
B. How many metres and centimetres of tape is required to pack a
carton of dimensions 50 cm × 40 cm × 30 cm as shown in the figure?

40 cm

30 cm

50 cm

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