如图,在△ABC中,∠BAC=90°,AB=AC=2,以AB为直径的圆交BC于D,则图中阴影部分的面积为( )
A:1
B:2
C:1+π4
D:2﹣π4
画一幅平面图,至少应该在图上注明的地理要素有( )
①方向 ②比例尺 ③图例(注记) ④颜色.
—— __________ take out the trash after dinner?——Yes, sure.
—You'd better ______ first. I'm afraid the size is a bit small for you.