Practical Geometry and Graphics |
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Page 11
... construction for finding the product of two numbers . Make OA = one of the numbers , OD = the other number , and OB = the unit . Join AB , and draw DC parallel to BA , then OC is the answer . If the given numbers are large , it is ...
... construction for finding the product of two numbers . Make OA = one of the numbers , OD = the other number , and OB = the unit . Join AB , and draw DC parallel to BA , then OC is the answer . If the given numbers are large , it is ...
Page 12
... construction is , however , sometimes more convenient . Draw two axes XOX , and YOY , ( Fig . 25 ) at right angles to one another . Make OA = the unit , and OA1 = a , the given number . Join AA and draw A1A , at right angles to A1A ...
... construction is , however , sometimes more convenient . Draw two axes XOX , and YOY , ( Fig . 25 ) at right angles to one another . Make OA = the unit , and OA1 = a , the given number . Join AA and draw A1A , at right angles to A1A ...
Page 16
... construction is based on the fact that the three angles of a triangle are together equal to 180 ° , and that the angles in the same segment of a circle are equal to one another ; also that in equal circles equal arcs subtend equal ...
... construction is based on the fact that the three angles of a triangle are together equal to 180 ° , and that the angles in the same segment of a circle are equal to one another ; also that in equal circles equal arcs subtend equal ...
Page 17
... construction is recommended when the one just given is objected to . With P ( Fig . 38 ) , the given external point as centre , describe the arc OSR , passing through O the centre of the given circle . With centre O and radius equal to ...
... construction is recommended when the one just given is objected to . With P ( Fig . 38 ) , the given external point as centre , describe the arc OSR , passing through O the centre of the given circle . With centre O and radius equal to ...
Page 20
... construction for finding the length of DC is based on the fact that DC × DE = DB2 . Second method ( Fig . 49 ) . Determine the circle ACB and the point D as in the first solution . Through D draw a straight line DQP cutting AB at Q ...
... construction for finding the length of DC is based on the fact that DC × DE = DB2 . Second method ( Fig . 49 ) . Determine the circle ACB and the point D as in the first solution . Through D draw a straight line DQP cutting AB at Q ...
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a₁ ABCD asymptotes axes bisects centre line chord conic construction crank cylinder described determined diagram distance Draw the plan Draw the traces drawn edge ellipse epicycloid epitrochoid equal equation face figure fixed forces given circle given in Fig given plane given point ground line helix horizontal plane horizontal trace hyperbola hyperboloid hypocycloid hypotrochoid inches inches in diameter inches long inches side inclined at 45 isometric projection meet moulding parabola parallel to XY picture plane plan and elevation plane containing plane of projection plane of section plane parallel position prism pyramid r₁ radius rays of light Referring to Fig right angles right circular cone rolling circle semi-minor axis shown in Fig shows simple harmonic motion solid sphere square straight line surface of revolution tangent plane tracing paper triangle vector velocity vertex vertical plane vertical trace