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\ 10-Nov-2025 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________

3. What are the area and perimeter of the following shapes? (each square = 1 sq. cm)

a. P = _______ b. P = _______
A = _______
A = _______

d.
c.
P = _______ P = _______
A = _______ A = _______

4. Use the square grid to draw two shapes with a perimeter of 12 cm but with different
areas.

5. Mayank is decorating the bulletin board in the school. The
bulletin board is a rectangle measuring 5 m by 3 m. He wants 3 m
to add a black border around the entire bulletin board. What
is the length of the border that he needs? 5 m

Mental Maths

21 st
Choose the correct option. Century #Critical Thinking
Skills
5 cm
1. The perimeter of the adjoining figure is: 2 cm

a. 14 cm b. 20 cm 2 cm
c. 16 cm d. 22 cm 5 cm 2 cm

2. The perimeter of a rectangle whose length and breadth are 13 cm and 5 cm respectively

is
a. 18 cm b. 56 cm c. 36 cm d. 23 cm

3. The length of the boundary wall of a rectangular garden which is 135 m long and 87 m
broad is
a. 221 m b. 325 m c. 444 m d. 222 m

4. The perimeter of a triangle is 47 m and its two sides are 15 m and 16 m. The measure of

the third side is
a. 14 m b. 16 m c. 22 m d. 24 m

5. The perimeter of a square whose side is 7 cm is

a. 28 cm b. 32 cm c. 14 cm d. 21 cm

178 Mathematics 4