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
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You cannot discover the perimeter of a triangle if all you have is the length of two sides and nothing else. Knowing only the length of two sides of a triangle is insufficient to discover the length of the third side, and, thereby, discover the perimeter. Use the link below to a related question and see how it works.
Assuming the object is a rectangular parallelepiped, use its density to find its volume and solve the equation V abc for c where a, b, and c are the height, length and width respectively
In which jobs we use perimeter and area?
Well, honey, making a shape with a perimeter of 9cm is as easy as pie. You could have a triangle with sides measuring 3cm, 3cm, and 3cm. Or you could have a rectangle with sides measuring 2cm and 2.5cm. Just remember, the perimeter is the sum of all the sides, so get those measuring tapes out and get creative!
We use perimeter to measure the length and breadth so that we can easily find out the measurement of a figure