1. Sayen yana buƙatar fahimtar nau'ikan bututun ƙarfe: A. Rarraba ta nau'in: madaidaiciyar bututun ƙarfe na ƙarfe, bututun ƙarfe mara nauyi, bututun ƙarfe na ƙarfe, da dai sauransu B. Rarraba nau'ikan sassan giciye na madaidaiciyar bututun ƙarfe: square bututu, rectangular bututu, elliptical bututu, lebur ellipse bututu, semicir ...
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