Question

如圖，畫(huà)出圖形繞點(diǎn)O逆時(shí)針旋轉(zhuǎn)90°后的圖形．

Answer 1

分析：根據(jù)網(wǎng)格結(jié)構(gòu)找出繞點(diǎn)O逆時(shí)針旋轉(zhuǎn)90°后轉(zhuǎn)折點(diǎn)的對(duì)應(yīng)位置，然后連接并作出半圓即可．

解答：解：如圖所示．

點(diǎn)評(píng)：本題考查了利用旋轉(zhuǎn)變換作圖，熟練掌握網(wǎng)格結(jié)構(gòu)準(zhǔn)確找出轉(zhuǎn)折點(diǎn)的位置是解題的關(guān)鍵．