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Infinitely many.
You can have a circle with a radius of approx 1.78 units.
Or, for any positive value of x,
an ellipse whose axes are x units and pi/(10*x) units in length,
a triangle whose base is x units and whose vertical height is 20/x units,
a parallelogram whose base is x units and whose vertical height is 10/x units.
And then there are polygons of 5, 6, sides and so on.
You can also combine a triangle with an area of 4 units with a semicircle with an area of 6 units and other weird and wonderful shapes.
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How do you make a triangle that has a primiter of 21 units and a area of 5 square units?
10, 10 and 1
Can you draw a rectangle that has an area of 5 square units and a perimeter of 12 units?
Yes, you can. If you make it 1 unit by 5 units
Convert 7400 square meters in to running meters?
It doesn't make sense to convert that. You can only convert units of the same kind, e.g., units of length to units of length; units of area to units of area; units of time to units of time, etc.
How many shapes can you make with an area of 5 square units?
12Infinitely many all different:As it is only the area that matters, the perimeter can be any shape:An equilateral triangle (with sides approx 3.398 units)A square (with sides approx 2.236 units)A regular pentagon (with sides approx 1.705 units)A regular hexagon (with sides approx 1.387 units)A regular heptagonA regular octagonA regular nonagonA regular decagonA regular hendecagon (11 sided polygon)A regular dodecagon (12 sided polygon)A regular triskaidecagon (13 sided polygon)A regular 14 sided polygonA regular 15 sided polygonA regular 16 sided polygon...A circle (with radius approx 1.262 units)And there are also the non-regular shapes, eg an L shaped hexagon, a kite, a parallelogram which can have an area of 5 square units.
How do you make a square with 7 shapes?
It depends on the 7 shapes that you start with.
