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ABCDEF altitude arcs to cut base angle Bisect centimetre circle in F circle to pass circle to touch conic sections construct a triangle crank OA describe a circle describe an arc describe arcs diagonal scale directrix distance Divide draw a circle Draw a line draw a square draw a straight eccentricity ellipse equal in area equal in length Example fig fair curve fixed point fixed straight line focus given base given circle GIVEN DATA Continued given point given straight line given triangle helix hexagons horizontal hyperbola hypotenuse inch internal diameter major axis mark minor axes parabola parallel pitch Plane Geometry Plot the locus points of intersection POLYGONS FROM GIVEN produce protractor radii regular polygon required circle required triangle right angles scale of chords shown in fig side straight line equal subtended table of chords technical drawing touch a given touch the given TRIANGLES AND POLYGONS vertical angle