Area of a triangle = (1/2)(base)(height)
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There is not enough information to solve this. You need to know one other length od a side to solve this.
I'm assuming that you mean the area of the triangle. You do not need the entire perimeter. The formula is 1/2 bh. b=base, h=hight
To find the base of a triangle with an area of 16 cm², you need to know the formula for the area of a triangle, which is Area = 1/2 * base * height. Without knowing the height of the triangle, it is impossible to determine the exact value of the base. Additional information or measurements are required to solve for the base length.
I don't know about the relation in the perimeters of a triangle and a parallelogram but if a triangle is on the same base on which the parallelogram is and the triangle is between the same parallel lines of the parallelogram, then the area of the triangle will be half the area of the parallelogram. That is, area of a triangle = 1/2 area of a parallelogram if the triangle is on the same base and between the same parallel lines.
To find the area of a triangle, you have to multiply the base of the triangle and the height of the triangle, then divide the product of those numbers by two.