The answer depends on what information you have about the shapes.
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A rhombus.
The area of the triangle in square meters is (1/2 the length of the triangle's base, in meters) times (the length of the triangle's height, in meters).
It sounds like the boundary of either a square or a rhombus with an area of 210.25 square meters.
Triangle, since the sum of its angles is 180. The sum of the angles of the square, rectangle, and rhombus are all 360.
136.952 square units