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一年一度的中考又拉下帷幕,透过考题,我们不难发现有许多考题的背景正是源于我们的日常生活中,尤其是有关锐角三角函数的考题更是贴近生活,甚至是我们每天在学习、生活时经常触摸的,为方便同学们的学习,现列举几例说明,希望你喜欢!一、电脑例1(2017年江西中考题)如图1,研究发现,科学使用电脑时,注视荧光屏幕画面的“视线角”α约为20°,而当手指接触键盘时,肘部形成的“手肘角”β约为100°.图2是其侧面
The annual senior high school entrance exam has come to an end. Through the exam questions, it is not difficult for us to find out that many exam questions come from our everyday life. In particular, the questions on acute trigonometric functions are even closer to our daily life. In the study, life is often touched, in order to facilitate the students to learn, we give a few examples, I hope you like! First, the computer example 1 (2017 Jiangxi test questions) Figure 1, the study found that the scientific use of computers, The “line-of-sight” α of the glow screen is about 20 °, and the “elbow angle” β formed by the elbow is about 100 ° when the finger touches the keyboard.