如图，直角等腰三角形ABC的斜边BC长8厘米，将这个三角形以顶点A为定点，沿顺时针方向旋转90度，那么斜边BC扫过的面积是多少平方厘米？
计算 0.62=×= 4×60%= 0×=÷2= 10÷=×3.6= 0.875÷0.125=
找准对应．（12）
×15=÷=÷50%= 8×25%=×0×=﹣= 0.5+=×=÷3=（﹣）×30=
16÷0.25====== 1﹣= 2.25+×=====
直接写得数×8=×= 81÷=÷= 63÷=÷=××= 3×÷3×= 36×25%=（﹣）×24=
×
= 4×60%= 0×
=
÷2= 10÷
=
×3.6= 0.875÷0.125=
×15=
÷
=
÷50%= 8×25%=
×0×
=
﹣
= 0.5+
=
×
=
÷3=（
﹣
）×30=
=
=
=
=
= 1﹣
= 2.25+
×
=
=
=
=
=
×8=
×
= 81÷
=
÷
= 63÷
=
÷
=
×
×
= 3×
÷3×
﹣
）×24=
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