A parallelogram is made up of two identical triangles. The area of the two triangles is 12 square decimeters, and the height is 4dm and 5DM

Parallelogram area = 12 * 2 = 24
S=a*h1=b*h2=24,
That is, 4A = 24, 5b = 24, so a = 6, B = 4.8,
The perimeter is 2 * 6 + 2 * 4.8 = 21.6

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