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Construction of Line SegmentConstruction of line segment is a drawing using ruler and compass. These are geometrical tools.In construction of line segment, the result is being verified using scale.It is used in building plan,roads etc. Draw a line segment of length 3.9 cm using a ruler. Solution : Step 1: Draw a line l. Mark a point on the line l. Step 2: Place the compasses pointer on the zero mark of the ruler. Open it to place the pencil point upto 3.9 cm. Step 3: Taking caution that the opening of the compasses has not changed, place the pointer on A and swing an arc to cut l at B. Step 4: segment AB is a line segment of required length. _________________________________________________________________ Construct a copy of a given segment. Step 1: Draw line segment CD of any length. Step 2: Fix the compasses pointer on C and the pencil end on D. Now this opening of the compasses gives the length of segment CD. Step 3 : Draw a line l. Mark a point A on the line l. Without changing the compasses setting, place the pointer on A. Step 4 : Cut an arc that cuts l at a point B. Now, AB is a copy of CD. _________________________________________________________________ 1) Construct segment AB of length 7.9 cm. From this, cut off AC of length 3.6 cm. Measure BC . 2) Draw any line segment CD . Without measuring CD , construct a copy of CD . 3) Construct two segments of lengths 4.3 cm and 3.2 cm. construct a segment whose length is equal to the sum of the lengths of these segments. Geometrical Constructions • Basic Geometric Constructions • Construction of Line Segment • Bisecting a Line Segment • Constructing Angles • Bisecting Angles • Constructing Parallel Lines • Construction of Triangle (SSS) • SAS Triangle Construction • ASA Triangle Construction • HL Triangle Construction (Rhs construction) • Constructing Quadrilaterals • Constructing Triangles(when sum of sides or perimeter is given)
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