A triangle is a three-sided polygon. The sum of angles in a triangle is 180 degrees.
Types of triangles
The perimeter of a triangle is (8t -7 + u) centimeters
The perimeter of a triangle is the sum of the three lengths of the triangle
2t +2 + 6t - 7 + u -2
Combine similar terms
(2t + 6t) + (2 - 7 - 2) + u
Add combined similar terms
8t -7 + u
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