Class 6 Math Solutions WBBSE Chapter 15 Determination Of Area And Perimeter Exercise 15
Let’s us draw, observe and write what I know
Question 1. I found my brother’s first geometric shape model is a triangle.
Solution:
⇒ Its perimeter is = _____ cm + _______ cm + ______ cm = 3 x 12 cm
To put a border around this geometric model, we need 36 cm of colored paper.
Solution:
⇒ Perimeter of the 1 st figure = 12 cm + 12 cm + 12 cm = 36 cm
Question 2. Let me find the perimeter of the second geometric figure. The perimeter of the second geometric figure = _____ cm + ________ cm + _________ cm + _________ cm = _______ cm. I shall need ______ cm of colored paper to put a border on it.
Solutions:
⇒ Perimeter of the 2nd figure
= 20 cm + 22 cm + 22 cm + 18 cm = 82 cm
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Question 3. The perimeter of the third geometric shape is = ________ cm + _______ cm + _____ cm + ______ cm + ________ cm + _____ cm = ________ cm
Solution:
⇒ Perimeter of the 3rd figure = 6 cm + 6 cm + 6 cm + 6 cm + 6 cm + 6 cm = 36 cm
Class 6 Math Solutions WBBSE
Question 4. Perimeter of the fourth geometric figure. = _____ cm + _____ cm + ______ cm + ______ cm + ______ cm + _______ cm + _______ cm + ______ cm + = _____ cm
Solution:
⇒ Perimeter of the 4th figure
= 5 cm + 13 cm + 30 cm + 13 cm + 5 cm + 7 cm + 20 cm + 7 cm
= 100 cm
Question 5. Perimeter of fifth geometric figure = _____ cm. + _______ cm + _____ cm + ________ cm + ______ cm + _________ cm + _______ cm + _______ cm = _____ cm
Solution:
⇒ Perimeter of the 5th figure
= 16 cm + 4 cm + 6 cm + 10 cm + 4 cm + 10 cm + 6 cm + 4 cm = 60 cm
WBBSE Math Solutions Class 6
Question 6. Let’s find the perimeter of the sixth geometric figure.
Solution:
⇒ Perimeter of the 6th figure
= 4 cm + 9 cm + 11 cm + 9 cm + 4 cm + 22 cm + 4 cm + 9 cm + 11 cm + 9 cm + 4 cm + 22 cm = 118 cm.
Hands-on trial: Now, we shall join points on graph paper to form different geometric figures and try to find the space occupied by these figures.
⇒ We pasted the graph paper on a cardboard. We formed different geometric figures on it by joining points and let’s try to find the area enclosed by them.
Example: Let’s fill up the data and let’s measure the area:
Solution:
