JLPT-N1
perfectly circular
真 ま
straight (ahead)くらtotal darknessくろpitch blackさきthe headしろpure whiteうえjust aboveこころsincerityしたright underぷたin two equal partsなかmiddleまえright in frontまるperfectly circular
丸 まる
まるcircleまるroundまるthe Japanese flagまるごとin its entiretyまるっきりcompletelyまるquiteまるまるcompletelyまるめるto make roundまるperfectly circular