1.Point A has coordinates (-2,1),point B has coordinates (3,3).If line segment AN is rotated 90° clockwise about point B,what are the coordinates of the image of point answer(1,8)2.What is the maximum number of peices that can be cut from a paper ci
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1.Point A has coordinates (-2,1),point B has coordinates (3,3).If line segment AN is rotated 90° clockwise about point B,what are the coordinates of the image of point
answer(1,8)
2.What is the maximum number of peices that can be cut from a paper circle with four straight cuts if none of the pieces are moved of folded between cuts?
answer:11
1..证明黄色三角全等 (先征白色小三角和下面的黄色相似,拿三线八角吧.再用边角边证两个黄的全等)最后得出(3-(3-1)=1,3+3-(-2)=8)
2. 和小学四年级奥数一样,把一个平面切4刀,最多能把平面分成多少份.
让每个交点都是由两条直线相交而成的.
1刀(2份) 2刀(2+2=4份) 3刀(2+2+3=7份) 4刀(2+2+3+4=11份)……
以类似的题目都可以做啦~ 比如说6刀(2+2+3+4+5+6)
不会
1.Point A has coordinates (-2,1),point B has coordinates (3,3).If line segment AN is rotated 90° clockwise about point B,what are the coordinates of the image of point answer(1,8)2.What is the maximum number of peices that can be cut from a paper ci
a point
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