Set Square 30°/60°
Set Square 30°/60°
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Set Square 30°/60° |
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Folding sheets Set Square 30°/60° Welcome page Back to the list |
Aveuglami project - folding sheet
Set Square 30°/60°
| Author | Unknown |
| Category | orimaths |
| Difficulty | * |
| Format | square or rectangle |
| Base | - |
| Text | Constructing a 30ƒ angle is a relatively simple operation, since you only need two folds. We can take advantage of this to build a square which will certainly be very useful. Either a square sheet or a rectangular sheet held in a vertical position is used. 1. Bring, using a valley fold from left to right, the right edge to the left edge. Unfold. 2. Bring the bottom right corner to the middle crease you just created. The fold starts from the lower left corner This fold is quite difficult to make. You must start by bringing the lower right corner to the middle fold, without marking the fold. We then prepare the start of the fold in the lower left corner, by pinching it very lightly. You must then adjust the position of the corner on the central fold until you obtain a very clear straight line segment. We obtain a quadrilateral (rectangular trapezoid) which carries a triangular flap linked by an oblique hinge fold. 3. Bring, through an oblique valley fold resting on the upper right edge of the triangular flap, the upper right corner on the hinge fold. We obtain a new triangular flap which partially covers the previous triangular flap. 4. Slide the new triangular flap under the first triangular flap. The first triangular flap becomes fully visible again. 5. Bring, through a valley fold resting on the upper left edge of the front triangular flap, the upper corner on the hinge fold. We obtain a triangular shape (rectangle triangle). If you lift the flap that you have just folded, you discover a small triangular pocket at the top and right. 6. Lift the front flap slightly to reveal a small pocket located at the top right of the fold. 7. Slide the upper top of the rear flap into the small pocket and close the upper flap. Here is a triangular set square which will allow you to measure angles at 90°, 30° and 60°. |
| Contents | File |
| Set Square 30°/60° - PDF file | ML-Orimaths13Ang.pdf |