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Five. A sixpence (when they were in use, up to about 1970) was worth half a shilling. A crown = five shilling, so a half-crown = 2 and a half shillings.
Many of them.
there are 36 ways to add up to
The three angles inside the triangle add up to 180 degrees.
It has five of them. Only the interior angles can add up to 540°.