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Les traits-carrés (Square
strokes)
Function :
how to draw a perpendicular line to another line AB, going through a point C, with compass.
Following are five examples commonly used in carpentry.
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1. Point C on the line AB
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2. Point C out of the line AB
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3. Using the same opening of compass
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4. Using another Point D out of the line AB
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5. The Point C is at the end of a line AB
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The Angles
Definition :
Figure formed by two lines extending
from the same point.
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1. Angle
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2. Straight Angle ( AÔB = 180° )
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. . Square Angle ( AÔC = 90° )
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3. Acute Angle ( Less than 90° )
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4. Obtuse Angle ( More than 90° )
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5. Re-entrant Angle ( More than 180° )
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6. Complementary Angles ( Equal to 180° )
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7. Supplementary Angles ( Equal to 90° )
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Calculation
of different Angles
Function : How to draw Angles with a Compass
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1. Regular Angles : 90° - 45° - 22.5°
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2. Regular Angles : 60° - 30° - 15°
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3. All the other Irregular Angles
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The
Bisector Line
Definition :
A straight line that bisects an Angle in two
Egal Parts
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1. Bisector Line Click here
2. Bisector Line of 90° = 45°
. . Bisector Line of 45° = 22.5°
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3. Bisector Line of 60° = 30°
. . Bisector Line of 30° = 15°
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The Arcs
Definition :
A continuous portion, as part of the circumference
of a circle, of a curved line )
Function :
How to find the Center O of:
1. An Arc AB
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2. An Arc without reference points
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The Curved Lines
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1. The Circle
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2. A Three-Centered Arch
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3. A Doucine
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THE POLYGONS
Definition :
A close plane figure bounded by straight lines and different angles.
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The Triangles
Definition :
A Polygon having three sides : AB - AC - BC and three angles BAC-ABC-ACB.
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Median :
a line from the vertex of a triangle to the midpoint of the opposite line
Bisector :
a straight line that bisects an angle in two equal parts
Height :
a line going perpendiculary from the top of a triangle to the opposite
side
1. Scalene Triangle
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2. Isosceles Triangle
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3. Equilateral Triangle
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4. Obtuse Triangle
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. . Right Triangle
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The Quadrilaterals
Definition
A plane Figure of Four
sides : AB - BC - CD - DA and Four Angles : BAD - ABC - BCD - ADC
Diagonal :
A Straight Line Joins two Opposite Angles
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1. Square
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2. Lozenge
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3. Parallelogram
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4. Rectangle
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5. Isosceles Trapezoid
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6. Irregular Trapezoid
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7. Right Trapezoid
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The Regular Polygons
Definition :
A closed plane figure bounded by same
straight lines and same egal angles )
Function :
How to draw different regular polygons by dividing a circle
in several equal arcs
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1. Commun Base
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2. Triangle
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3. Square
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4. Pentagon
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5. Hexagon
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6. Heptagon
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7. Octagon
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8. Nonagon
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