2Points and LinesA point is used to represent a location in space but has no width, height, or depth.A line is used in drawings to represent the edge of a solidobject.
3AnglesAn angle is formed by two intersecting lines. A common symbol for angle isShowing Angles
4Geometric Constructions TrianglesA triangle is a plane figure bounded by three straight sides.The sum of the interior angles is always 180º.
5Geometric Constructions Circles and ArcsA circle is a closed curve, all points of which are the same distance from a point called the center.
6Geometric Constructions Drawing an Arc Tangent to a Line and Through a Point with given radiusGiven line (AB), point (P), and radius (R)Draw line (DE) parallel to the given line (AB) at the distance (R) from it.From point (P) draw an arc with a radius (R) intersecting line (DE) at point (C).From point (C) draw the arc tangent to line (AB) and through point (P).
7Drawing an arc tangent to a line or arc and through a point
8Geometric Constructions Drawing an Arc Tangent to Two Lines at Acute or Obtuse AnglesGiven two intersecting lines not making a 90º angle and the distance (R)Draw lines parallel to the given lines at a distance (R) from them to intersect at point (C).With (C) as the center and with the given radius (R) draw the required tangent arcs between the given lines.
9Geometric Constructions Drawing an Arc Tangent an Arc and a Straight LineGiven the straight line (AB) and the arc with radius (G) and the radius of desired arc (R)Draw a line parallel to the given lines at the distance (R).Draw an arc from center (O) with a radius equal to (G) plus (R) to intersect at (C).With (C) as the center and with the given radius (R) draw the required arc at the given radius (R) and tangent to the given line and arc.
10Geometric Constructions Drawing an inside Arc Tangent to Two ArcsGiven the two arcs with centers (A) and (B) and the radius of desired arc (R)With (A) and (B) as centers draw arcs parallel to the given arcs at the distance (R) from them to locate the intersection (C).With (C) as the center draw the required tangent arc at the given radius (R) to the given arcs.
11Drawing an arc tangent to two arcs enclosing one or both