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Mental Maths

21 st
Choose the correct option. Century #Critical Thinking
Skills
1. The perimeter of a rectilinear figure is:

a. the product of its all sides b. the sum of all its sides
c. the difference of its length and breadth
d. None of these.

2. Which of the following is not a rectilinear figure?
a. Circle b. Square c. Triangle d. Rectangle
3. Each of the equal sides of an isosceles triangle is 7 cm and its third side is 9 cm. The
perimeter of the triangle is:
a. 25 cm b. 18 cm c. 23 cm d. 19 m
4. The perimeter of a rectangular field is 186 cm and its length is 65 cm. The breadth of
the field is:

a. 82 cm b. 28 cm c. 91 cm d. 28 m

HOTS

21 st
Century #Computational Thinking
Skills
How many unique rectangles of different dimensions (in complete cm) can be made with
1. a perimeter of 24 cm?

2. an area of 24 sq. cm?

Fun Activity 21 st

Century #Creativity
Skills
Make 3-4 students stand at different positions (not in a straight line) in your school
playground, or any other place in your school. Ask the students to measure the
distances between them using a measuring tape or a rodometer (a measuring wheel).
Mark their positions and draw straight lines between each of them. What is the figure
obtained by the straight lines? Now, find the perimeter of the figure formed.

204 Mathematics 5