数学七下练习题?《》
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/15 18:19:23
数学七下练习题?《》
![](http://img.wesiedu.com/upload/8/2a/82a196fdeb608f1e7c2a4792273a0217.jpg)
![](http://img.wesiedu.com/upload/8/2a/82a196fdeb608f1e7c2a4792273a0217.jpg)
![数学七下练习题?《》](/uploads/image/z/11973622-22-2.jpg?t=%E6%95%B0%E5%AD%A6%E4%B8%83%E4%B8%8B%E7%BB%83%E4%B9%A0%E9%A2%98%3F%E3%80%8A%E3%80%8B)
(1)
∠A
∠A=180°-∠B-∠C
=180°-60°-20°
=100°(三角形内角和等于180度)
∠ACD
∠ACD=180°-20°
=160°
(2)
∠ACB
∠ACB=180°-∠A-∠B
=180°-20°-10°
=150°(三角形内角和等于180度)
∠ACD
∵∠ACB=150°
∴∠ACD=180°-150°
=30°
∠A
∠A=180°-∠B-∠C
=180°-60°-20°
=100°(三角形内角和等于180度)
∠ACD
∠ACD=180°-20°
=160°
(2)
∠ACB
∠ACB=180°-∠A-∠B
=180°-20°-10°
=150°(三角形内角和等于180度)
∠ACD
∵∠ACB=150°
∴∠ACD=180°-150°
=30°