well all triangles are 160 degrees or was it 180??? anyways if you have a problem like this: 20, 56, x to find the value of x you do 20 + 56 = 76 so 160 or 180 - 76= 84 or 104 is the value of x. hope this helps if not sorry for confusing you
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the plane figure has 2 dimension and spatial figure has 3 dimension
yes, a triangle is a closed figure
A line has one dimension- length. This is evident if we compare a line to a point and a plane figure. A point has no dimension; it merely marks a location. A plane figure, such as a square, circle, or triangle, has two dimensions. They have both length and height. A line is between a point and a plane figure. It has length, but it does not have width. ------------------------ 1 dimension. Here is a comparison of dimensions: 0 (dimension): Point 1: Lines 2: Plane 3: Solid, space 4+: Hypersurfaces, hypercubes, Klein bottles
If a figure is not a triangle then it does not have three sides ,is the contrapositive of the statement given in the question.
A polygon is a closed figure bounded by sides. A triangle is a closed figure bounded by three sides. Therefore, according to the definition of polygon triangle is a polygon.