Mathematics on the corner there is an obtuse, straightAngle, acute Angle, right Angle, the students, what Angle ah?
数学上的角有钝角，平角，锐角，直角，同学们，还有什么角啊？
2
The causes of diagonal deviation of straightAngle cutter were examined from all aspects of the situation. The measures of deviation-controlling was recommended.
从不同角度分析玻璃直线斜边机产生斜边对角偏差的原因，提出控制斜边对角偏差的措施。
3
Cut straight down, at a right Angle to board. with a quick stroke of the knife blade. pushing the potato slice away from the potato as you hit the board.