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        ∵si

        cebecause因为

        ∴he

        ce所以

        ∷equalsasproportio

        等于，成比例

        ∠a

        gle角

        ⌒semicircle半圆

        ⊙circle圆

        ○circumfere

        ce圆周

        πpi圆周率

        △tria

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