已知长方形ABCD面积是60cm²,S△AEF=20cm²,求阴影部分面积?
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分享交流一下我的解题思路:
ACDF是直角梯形,
S▱ACDF=2×S△AEF=2×20=40cm²
S阴=S▱ABCD-S▱ACDF
=60-40=20cm²
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