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The perimeter of a triangle is the sum of the lengths of its sides. In this case, the perimeter of the triangle with sides measuring 3 inches, 5 inches, and 7 inches is 3 + 5 + 7 = 15 inches.
Perimeter: 5+10+length of its 3rd side
Perimeter = distance around all 4 sides = 12 + 5 + 12 + 5 = 34 inches.
Perimeter = 2*(5 + 7) = 24 inches.Area = 5 * 7 = 35 square inches.
-- Perimeter = distance all the way around it = (5 + 7 + 5 + 7) inches -- Area = (5 x 7) square inches