Add the lengths of any two adjacent sides, and double the sum.
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In order to find the area of parallelogram is found by knowing the area formula. The formula is A=b(base) multiplied by H(height).
To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle. To find the area of a triangle find the base and the height of the triangle. Then multiply the base by the height, then divide by 2. To find the perimiter of a triangle add together the outside edge of the triangle.
2 * pi * r
The perimeter is 31.11 units.