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几何学并不神秘,它就在我们的身边,车轮是圆的,地砖通常做成正方形、正六边形,桥梁、屋架常用三角形结构,而商店里的活动栅栏门却用四边形结构,门窗两条对边都是平行的,电线杆和地面是垂直的,这些常常见到的物体的外形也称为几何图形,就是我们几何学研究的对象。初中几何研究的对象是指在同一平面内的几何图形即称平面几何。它包括许许多多重要
Geometric is not mysterious, it is on our side, the wheels are round, the floor tiles are usually made of squares, regular hexagons, bridges, trusses commonly used triangular structure, and the activities of the store door with a quadrilateral gate structure, two doors and windows Parallel to the side, poles and the ground is vertical, the appearance of these often seen objects, also known as the geometry, is our object of geometric study. The object of junior high school geometry research is that the geometry in the same plane is called plane geometry. It includes so many things