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### Grade 7 - Mathematics9.19 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.
 Q 1: The sides of the triangle ABC are 7 cm, 8 cm and 10 cm. Find its perimeter.20 cm30 cm25 cm15 cm Q 2: The sides of the triangle ABC are 28 cm, 29 cm and 32 cm. Find its perimeter.89 cm79 cm45 cm99 cm Q 3: The sides of the triangle ABC are 6 cm and 9 cm. Find the remaining side if its perimeter is given by 25 cm.10 cm15 cm35 cm20 cm Q 4: The sides of the triangle ABC are 119.23 cm, 129.32 cm and 110.56 cm. Find its perimeter.326.23 cm359.11 cm338.12 cm348.56 cm Q 5: 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.17 cm19 cm18 cm20 cm Q 6: The sides of the triangle ABC are 12y cm, 18y cm and 14y cm. Find 'y' if its perimeter is given by 1408 cm.36 cm38 cm32 cm30 cm Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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