Elements of Geometry: With Practical Applications ... |
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Page 6
... Half a right angle One third of a right angle Two thirds of a right angle ... equal portions , each being a right angle . Therefore the entire ... measure of a like fractional part of 360 ° ; thus , one fourth of the circumference is the ...
... Half a right angle One third of a right angle Two thirds of a right angle ... equal portions , each being a right angle . Therefore the entire ... measure of a like fractional part of 360 ° ; thus , one fourth of the circumference is the ...
Page 79
... measured by half the arc of that chord . Let AB be a tangent , and CD A a chord drawn from the point of contact C ; then the angle BCD will be measured by half the arc CGD , and the angle ACD will be measured by half the arc CLD . Draw ...
... measured by half the arc of that chord . Let AB be a tangent , and CD A a chord drawn from the point of contact C ; then the angle BCD will be measured by half the arc CGD , and the angle ACD will be measured by half the arc CLD . Draw ...
Page 80
... equal to the right angle FCB . From each of these equals , take away the common angle FCK , and there remains the angle CFK equal to the angle BCD . But the angle CFK is measured by the arc CG ( B. III , Def . 12 ) , which is half of ...
... equal to the right angle FCB . From each of these equals , take away the common angle FCK , and there remains the angle CFK equal to the angle BCD . But the angle CFK is measured by the arc CG ( B. III , Def . 12 ) , which is half of ...
Page 81
... half the arc that subtends it . Let BAC be an angle at the circumference : it has for its measure , half the arc BC ... measured by half the difference of the said arcs ; that is , the angle BAC is measured by half the arc BC upon which ...
... half the arc that subtends it . Let BAC be an angle at the circumference : it has for its measure , half the arc BC ... measured by half the difference of the said arcs ; that is , the angle BAC is measured by half the arc BC upon which ...
Page 82
... measured by half the arc on which it stands , it follows that the two opposite angles of an inscribed quadrilateral , together , must be measured . by half the entire circumference , which is the measure of two right angles ...
... measured by half the arc on which it stands , it follows that the two opposite angles of an inscribed quadrilateral , together , must be measured . by half the entire circumference , which is the measure of two right angles ...
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Common terms and phrases
a+b+c AC² altitude angle ACD angle BAC bisect centre chord circ circular sector circumference cone consequently convex surface cylinder diagonal diameter distance draw equal and parallel equiangular equilateral triangle equivalent exterior angle figure formed four right angles given line greater half the arc hypothenuse inscribed circle intersection isosceles join less Let ABC lines drawn magnitude measured by half meet multiplied number of sides opposite angles parallel planes parallelogram parallelopipedon pendicular perimeter perpendicular plane MN point G prism PROBLEM produced Prop PROPOSITION pyramid radii radius rectangle regular polygon respectively equal right angles right-angled triangle Sabc Schol Scholium semicircle semicircumference side AC similar similar triangles solid angle solid described sphere spherical triangle square straight line suppose tangent THEOREM three sides triangle ABC triangular prism vertex VIII
Popular passages
Page 37 - The sum of all the angles of a polygon is equal to twice as many right angles as the polygon has sides, less two.
Page 180 - THEOREM. If one of two parallel lines is perpendicular to a plane, the other will also be perpendicular to this plane. Let AP & ED be parallel lines, of which AP is perpendicular to the plane MN ; then will ED be also perpendicular to this plane.
Page 139 - PROBLEM. To inscribe a circle in a given triangle. Let ABC be the given triangle : it is required to inscribe a circle in the triangle ABC.
Page 224 - The radius of a sphere is a straight line, drawn from the centre to any point of the...
Page 43 - In a right-angled triangle, the side opposite the right angle is" called the Hypothenuse ; and the other two sides are cal4ed the Legs, and sometimes the Base and Perpendicular.
Page 184 - THEOREM. If two angles, not situated in the same plane, have their sides parallel and lying in the same direction, they will be equal, and the planes in which they are situated will be parallel.
Page 10 - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another.
Page 226 - We conclude then, that the solidity of a cylinder is equal to the product of its base by its altitude.
Page 22 - If two sides and the included angle of the one are respectively equal to two sides and the included angle of the other...
Page 12 - If equals be added to unequals, the wholes are unequal. V. If equals be taken from unequals, the remainders are unequal. VI. Things which are double of the same, are equal to one another.