看圖填空.
(1)指針從“12”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)60°到“2”;
(2)指針從“12”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)(
90
90
°)到“3”;
(3)指針從“1”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)(
150
150
°)到“6”;
(4)指針從“3”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)30°到“
4
4
”;
(5)指針從“5”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)60°到“
7
7
”;
(6)指針從“7”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)(
150
150
°)到“12”.
分析:由于時(shí)針一大格是30°,根據(jù)旋轉(zhuǎn)的定義,找準(zhǔn)旋轉(zhuǎn)的方向和旋轉(zhuǎn)的角度即可求解.
解答:解:(1)指針從“12”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)60°到“2”;
(2)指針從“12”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)(90°)到“3”;
(3)指針從“1”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)(150°)到“6”;
(4)指針從“3”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)30°到“4”;
(5)指針從“5”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)60°到“7”;
(6)指針從“7”繞點(diǎn)A順時(shí)針旋轉(zhuǎn)(150°)到“12”.
故答案為:90;150;4;7;150.
點(diǎn)評(píng):本題考查了生活中的旋轉(zhuǎn)現(xiàn)象,要看清是順時(shí)針還是逆時(shí)針旋轉(zhuǎn),旋轉(zhuǎn)多少度,讀懂題意是解答的基礎(chǔ).
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