Elements of Plane GeometryE.H. Butler & Company, 1882 - 196 σελίδες |
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Σελίδα 20
... four angles formed equals four right angles . 50. COR . 2. — The sum of all the angles that can be formed at a common point equals four right angles . THEOREM V. 51. From a point without a straight line 20 ELEMENTS OF PLANE GEOMETRY .
... four angles formed equals four right angles . 50. COR . 2. — The sum of all the angles that can be formed at a common point equals four right angles . THEOREM V. 51. From a point without a straight line 20 ELEMENTS OF PLANE GEOMETRY .
Σελίδα 55
... four , a Quadrilateral ; of five , a Pentagon ; of six , a Hexagon ; of seven , a Heptagon ; of eight , an Octagon ; of nine , a Nona- gon ; of ten , a Decagon ; of twelve , a Dodecagon . ANGLES OF A POLYGON . THEOREM XXXVIII . 114. The ...
... four , a Quadrilateral ; of five , a Pentagon ; of six , a Hexagon ; of seven , a Heptagon ; of eight , an Octagon ; of nine , a Nona- gon ; of ten , a Decagon ; of twelve , a Dodecagon . ANGLES OF A POLYGON . THEOREM XXXVIII . 114. The ...
Σελίδα 57
... four right angles . Let ABCDE be a polygon of n sides , and let the sides be produced so as to form the exterior s a , b , c , d , e . E e d D C a B b To prove that a + 2 b + 2 c + L d + Le = 4 Ls . At each vertex there are two s whose ...
... four right angles . Let ABCDE be a polygon of n sides , and let the sides be produced so as to form the exterior s a , b , c , d , e . E e d D C a B b To prove that a + 2 b + 2 c + L d + Le = 4 Ls . At each vertex there are two s whose ...
Σελίδα 58
Franklin Ibach. QUADRILATERALS . DEFINITIONS . 117. A Quadrilateral is a polygon of four sides . 118. There are three classes of quadrilaterals , namely , Trapeziums , Trapezoids , and Parallelograms . 119. A Trapezium is a quadrilateral ...
Franklin Ibach. QUADRILATERALS . DEFINITIONS . 117. A Quadrilateral is a polygon of four sides . 118. There are three classes of quadrilaterals , namely , Trapeziums , Trapezoids , and Parallelograms . 119. A Trapezium is a quadrilateral ...
Σελίδα 71
... four equal tri- angles . 6. If one of the acute angles of a right - angled triangle is double the other , the hypothenuse is double the shortest side . 7. If through any point in the base of an isosceles triangle parallels to the equal ...
... four equal tri- angles . 6. If one of the acute angles of a right - angled triangle is double the other , the hypothenuse is double the shortest side . 7. If through any point in the base of an isosceles triangle parallels to the equal ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
AB² ABC and DEF AC and BC acute angle adjacent angles angles are equal angles equals angles formed arc AC BC² bisectors bisects centre CF meet chord common point Concave Polygon construct Convex Polygon COR.-The decagon DEF are similar diagonal BC diameter Draw the diagonal equally distant equals two right equiangular Equilateral Polygon exterior angles given circle given straight line homologous sides hypothenuse included angle intersect La=Lb Let ABCD line joining lines drawn measured by arc medial lines middle point oblique lines parallelogram perimeter PLANE GEOMETRY produced proportion Q. E. D. THEOREM Q. E. F. PROBLEM quadrilateral radii radius rectangle regular inscribed regular polygon respectively equal rhombus right angles right-angled triangle SCHOLIUM secant similar polygons square Subtract tangent third side trapezoid triangles are equal vertex vertical angle
Δημοφιλή αποσπάσματα
Σελίδα 14 - Things which are equal to the same thing, are equal to each other. 2. If equals are added to equals, the sums are equal. 3. If equals are subtracted from equals, the remainders are equal. 4. If equals are added to unequals, the sums are unequal.
Σελίδα 83 - In a series of equal ratios, the sum of the antecedents is to the sum of the consequents as any antecedent is to its consequent.
Σελίδα 85 - 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.
Σελίδα 44 - If two triangles have two sides of the one respectively equal to two sides of the other, and the included angles unequal, the triangle which has the greater included angle has the greater third side.
Σελίδα 14 - Axioms. 1. Things which are equal to the same thing are equal to each other. 2. If equals are added to equals, the wholes are equal. 3. If equals are taken from equals, the remainders are equal.
Σελίδα 136 - In any triangle, the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides, minus twice the product of one of these sides and the projection of the other side upon it.
Σελίδα 123 - Upon a given straight line to describe a segment of a circle, which shall contain an angle equal to a given rectilineal angle.
Σελίδα 55 - A polygon of three sides is a triangle ; of four, a quadrilateral; of five, a pentagon ; of six, a hexagon ; of seven, a heptagon; of eight, an octagon; of nine, a nonagon; of ten, a decagon; of twelve, a dodecagon.
Σελίδα 137 - In any triangle the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides diminished by twice the product of one of those sides and the projection of the other upon that side.
Σελίδα 177 - From this proposition it is evident, that the square described on the difference of two lines is equivalent to the sum of the squares described on the lines respectively, minus twice the rectangle contained by the lines.