(按我说的画图:AB=8cm,BC=15cm,AC=17cm,折叠后AB与AC边重合交于D,折痕是AE)
依题意得,AB=AD=8cm,设BE=DE=x cm,S△DEC=S△ABC-S△ABE-△ADE,所以1/2DE×CD=1/2AB×BC-1/2AB×BD×2 所以1/2×9x=1/2×8×15-1/2×8x 解得x=4.8
所以未覆盖的面积=1/2×4.8×9=20.7平方厘米
(按我说的画图:AB=8cm,BC=15cm,AC=17cm,折叠后AB与AC边重合交于D,折痕是AE)
依题意得,AB=AD=8cm,设BE=DE=x cm,S△DEC=S△ABC-S△ABE-△ADE,所以1/2DE×CD=1/2AB×BC-1/2AB×BD×2 所以1/2×9x=1/2×8×15-1/2×8x 解得x=4.8
所以未覆盖的面积=1/2×4.8×9=20.7平方厘米