## Observational Geometry |

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ABCD acute altitude arrangements base beginning bounded calculate called centimetres centre CHAPTER chord circle circumference common compasses cone consist Construct convenient corners corresponding cube cubic curved surface cylinder diagonals diagram will need diameter direction distance divided draw drawn edges ends equal equilateral triangle faces feet figure five four give given greatest number horizontal inches kind lateral length mark means measure meet metres middle points multiplied need paper notice number of points object obtuse one-half opposite parallel parallel lines parallelogram parallelopiped pentagons perpendicular plane points of intersection polygon possible prism problem proportion protractor pyramid question radii radius rectangle regular represents right angle rule ruler shape sides similar smaller solid sphere square straight lines Suppose surface tangent trapezoid triangle various vertex vertices volume