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Date:___________________

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Grade 7 - Mathematics
9.19 Perimeter of the Triangle

Example:
The sides of the triangle ABC are 12 cm, 5 cm and 9 cm. Find its perimeter.

Example:
Perimeter of the triangle (P) = S1 + S2 + S3
Where P is the perimeter of the triangle, S1, S2 and S3 are the sides of the triangle.
Given that,
S1 = 12 cm, S2 = 5 cm and S3 = 9 cm.
Hence P = 12 + 5 + 9
i.e P = 26 cm.
Therefore, the perimeter of the given triangle is 26 cm.


Directions: Read the above example carefully and answer the following questions. Also draw 10 different triangles, measure their angles and find their perimeters.

Name: ___________________

Date:___________________

Grade 7 - Mathematics
9.19 Perimeter of the Triangle

Q 1: The sides of the triangle ABC are 142 cm, 182cm and 192 cm. Find its perimeter.
831 cm
844 cm
829 cm
881 cm

Q 2: The sides of the triangle ABC are (x + 4) cm, (x + 8) cm and (x + 7) cm. Find 'x' if its perimeter is given by 70 cm.
20 cm
19 cm
17 cm
18 cm

Q 3: The sides of the triangle ABC are 7 cm, 8 cm and 10 cm. Find its perimeter.
20 cm
30 cm
15 cm
25 cm

Q 4: The sides of the triangle ABC are 119.23 cm, 129.32 cm and 110.56 cm. Find its perimeter.
348.56 cm
359.11 cm
338.12 cm
326.23 cm

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Question 6: This question is available to subscribers only!


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