## Observational Geometry |

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### Common terms and phrases

ABCD acute aid of compasses Calculate the area centre chord circumference cone Construct corners cube cubic centimetres curved line curved surface cylinder decimetres diagonals diagram will need diameter diedral angles distance Draw a diagram draw a line Draw a square drawn edges 5 cm equilateral polygon equilateral triangle four frustum given straight line greatest number group being parallel group cutting hexagon horizontal Icosagon lateral surface length measure metres middle points multiplied Nonagon number of edges number of faces number of lines number of points number of straight obtuse one-half parallel lines parallel ruler parallelogram parallelopiped pentagon perpendicular plane points of division points of intersection protractor pyramid quadrilateral radii radius equal rectangle regular polygon rhombus right angle right triangle shape sides slant height solid angle special figure sphere square with edges symmetry tangent three points three straight lines total number trapezoid vertices volume word meaning

### Popular passages

Page 185 - The area of a parallelogram is equal to the product of its base and its height: A = bx h.

Page 50 - The formula states that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the base and altitude.

Page 221 - The areas of two similar triangles (or polygons) are to each other as the squares of any two corresponding sides.

Page 89 - CIRCLE is a plane figure bounded by a curved line, all the points of which are equally distant from a point within called the centre; as the figure ADB E.

Page 186 - The area of a triangle is equal to one-half the product of its base and altitude.

Page 115 - The area of the surface of a sphere is four times the area of a great circle.

Page 54 - The square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides.

Page 166 - AB of the circle into as many equal parts as the polygon is to have sides. With the points A and B as centers and radius AB, describe arcs cutting each other at C.

Page 188 - Hence the area of a trapezoid is equal to its altitude, multiplied by the line which joins the middle points of the sides which are not parallel.

Page 107 - The volume of a cylinder is equal to the area of its base multiplied by the altitude.