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### Grade 7 - Mathematics7.4 Perimeter of a Triangle

 Points to remember: Perimeter of a triangle: The sum of the measures of AB, BC and CA is called the perimeter of the triangle ABC. Perimeter of triangle ABC = BC + CA + AB = a + b + c, where a, b and c are the lengths of the sides BC, CA and AB. Example: The length of sides of a triangle are given by a = 2 cm, b = 5 cm, and c = 4 cm. Find the perimeter of the triangle formed by the lines segments BC, CA, and AB. Answer: Perimeter of the triangle = a + b + c = 2 + 5 + 4 = 11 cm Directions: Read the above review points carefully and answer the following questions: Illustrate each of the above review points by drawing a triangle. Explain in your own words how to find the perimeter of triangles.
 Q 1: The perimeter of a triangle whose sides are a = 3 cm, b = 7 cm and c = 8 cm is _________ cm.Answer: Q 2: If the perimeter of a triangle with sides a = 6 cm, b = 3 cm is 13 cm, then the value of c will be _________ cm.Answer: Q 3: Find the perimeter of a triangle whose sides are 33.25 cm, 52.45 cm and 49.30 cm. (Type the answer as Number space Units)Answer: Q 4: The perimeter of a triangle whose sides are given by a = 2/3 cm, b= 5/3 cm and c = 11/3 cm is _________.6 cm18 cm7/3 cm Q 5: A triangle has a perimeter of 50 cm. If 2 of its sides are equal and the third side is 5 more than the equal sides, then the length of the third side is _________ cm. Answer: Q 6: The perimeter of a triangle with sides x, y and z is given by _________. xyzx + y + zx+y, y+z, z+x Q 7: The perimeter of a triangle ABC is given by 45 cm. If the length of the side AB is 2 more than the length of the side BC and length of the side BC is 5 more than the length of the side CA, then the length of side AB is _________. 21 cm20 cm18 cm Q 8: "The perimeter of a triangle is always measured in centimeter's".FalseTrue Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

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