no
find the perimeter and area of a rectangle that is 15cm long and 5cm wide
That's oddly worded. You can't find the area of a perimeter. Either way, we need to know how many sides there are. A square with 6-inch sideshas a perimeter of 24 inches and an area of 36 square inches.
how to find the perimeter of a right angled triangle using the area
You break it up into smaller shapes which are less irregular. If these are more regular, you can calculate their contribution to the perimeter, and their area. You can then add these together.
It is impossible
Not exactly. If I know the side lengths, I can still find the perimeter
Divide the perimeter by 4 and then square the result to find the area of the square.
no
You square-root the area
You can find the perimeter of a rectangle if you know its area and the length of one side. Divide the area by the length of the known side and the quotient will be the length of a side perpendicular to the known side, and then multiply the sum of the two sides by two to find the perimeter.
no
You cannot. For a given area, an equilateral triangle will have the smallest perimeter but that perimeter can be increased - without limit - without increasing the area.
To find the perimeter you add and to find the area we multiply.
If you know the area the divide area by length if you know perimeter subtract it by 2xlength and divide by 2
Only if you also know the shape and proportions. An equilateral triangle, for example.
multiply the widht time s the length