Perimeter of a Polygon

The perimeter of a square is calculated as 4 × side length. For a side length of $6cm$, the perimeter is $4\times 6=24cm$.

The perimeter of a rectangle is calculated as $2\times (\text{length}+\text{width})$. For a length of $8cm$ and a width of $5cm$, the perimeter is $2\times (8+5)=26cm$.

For an equilateral triangle, all sides are equal. To find one side, divide the perimeter by 3: $36÷3=12cm$.

The perimeter of a triangle is the sum of all its sides. Add $12+10+10=32cm$.

The perimeter of an irregular hexagon is the sum of its side lengths: $7+12+10+8+11+9=57cm$.

The side length of the square is $100÷4=25cm$. Increasing it by $5cm$ gives $30cm$. The new perimeter is $4\times 30=120cm$.