다음 직사각형 abcd에서 변 ab와 변ad의 길이는 각각 18cm , 12cm라고 합니다. 분할하여 만들어진 삼각형 abf, bce,사각형 bedf의 넓이가 같다고 합니다. 삼각형 bef의 넓이는 얼마입니까??? 풀이도 써주세요~!
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