The meter ruler is made of wood or plastic and is usually considered as a ruler for measuring the length in centimeters. Usually engraved with centimeters and millimeters. Meter ruler: made of wood or plastic, it is only one meter long and cannot be bent. The picture shows the physical meter ruler for teaching.
Tape measure: made of plastic and other materials, ranging from one meter to two meters, can be bent, used for cutting clothes, and can also be used for physical education teaching (measuring length in long jump and shot put). Tape measure: made of metal and other materials, ranging from 3 to 5 meters, with certain flexibility, used for decoration and other projects, but also for daily life.
Folding ruler originally refers to a wooden ruler with four creases. It is a common measuring tool for measuring wood, marking and processing furniture, and also a common teaching tool. There are also plastic-steel folding rulers, which are mostly made of plastic and stainless steel. Folding rulers are mostly made of wood, in addition to plastic and steel folding rulers. In fact, the wooden folding ruler is more accurate than the steel folding ruler, because it expands less when heated and contracts less when cooled, so it will have little influence on the accuracy. The biggest feature of folding ruler is that it can be folded, which is convenient to carry and saves space.
Folding ruler uses:
In mathematics teaching, wooden folding ruler can be used to easily form various teaching aid models such as plane graphics and three-dimensional graphics, and some mathematics teaching demonstrations can be carried out for intuitive teaching. Clever use of wooden folding ruler, multi-purpose, convenient and practical, economical and practical.
For example, wooden folding ruler is used to form various plane figures, and in teaching, wooden folding ruler is used to form polygons such as square, rectangle, trapezoid, triangle, diamond, regular pentagon, regular hexagon, regular heptagon and regular octagon.
Demonstrate the stability of the triangle: make a prism model: first, use two wooden folding rulers to form two congruent triangles as the two bottom faces of the prism, and then cut three thick iron wires with a diameter of 2mm (the length should be 25cm-30cm, and the three lengths must be the same). Straighten these three thick iron wires, and insert both ends into the hinge pit of the wooden folding ruler that forms the bottom surface (if it is too loose, you can stick a small piece of adhesive tape on the edge of the hinge pit to make the tightness appropriate) to make a straight triangular prism model.