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Question
The table given below contains some measures of the triangle. Find the unknown values.
| Side 1 | Side 2 | Side 3 | Perimeter |
| 11 feet | ? | 9 feet | 28 feet |
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Solution
Perimeter of a triangle = sum of three sides
Perimeter = side 1 + side 2 + side 3
28 feet = 11 feet + side 2 + 9 feet
28 feet = 20 feet + side 2
28 – 20 = side 2
side = 8 feet
Tabulating the unknowns.
| Side 1 | Side 2 | Side 3 | Perimeter |
| 11 feet | 8 feet | 9 feet | 28 feet |
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