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Kinda forgot the sides being parallel part. Like missing a step in assembling IKEA furniture, its not gonna turn out right.
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You don't normally need to specify that the sides are parallel if you specify four right angles.
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Also pretty sure definition of a shape requires only one enclosed or contiguous area.
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This one is enclosed and contiguous though, the lines of the triangle end where the circular line starts. (The rest is just a drafting residue.)
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No, it is 2 contiguous regions. The line of separation is the bounding line of a "shape."
Otherwise, the entire whitespace outside of the region is also part of the shape, as is anything it touches.
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OK, imagine the space outside of the shape is black, or see through or whatever.
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Well then the line of separation means nothing and then you've lost two right angles to the contiguous void.
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Why? Does a cube floating in the void not have angles?
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Without a distinction of where the cube begins or ends it does not because there is no cube and there are no angles.
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The angle of the triangle that protrudes into the circular part is not a right angle.
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My apologies you're correct, you lose two right angles.
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Those arc sides are parallel in polar coordinates.
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