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a b and c d a b d a c b a c d a m c acute angles adjacent angle angle contained angles a b c angles are equal angles equal b a c b d c b d e base c b d c m b called centre chords circumference cut the circle demonstration diameter dodecahedron draw edges equal angles equilateral exterior angle greater inscribed interior and opposite isosceles triangle LESSON likewise lines a b lines be drawn M.—Compare M.—Demonstrate M.—Express M.—Hence M.—What M.—When obtuse angle opposite angles P—The P.—That P.—The angle parallel lines parallelogram pentagon perpendicular plane angles point of contact pupils quadrilateral figure rectangle contained rhomb right angles semi-circumference slates solid angles sphere square straight line joining tangent trapezium triangle a b c triangles are equal truth twice the rectangle unequal whole line
Side 98 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Side 134 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square on the side subtending the obtuse angle, is greater than the squares on the sides containing the obtuse angle, by twice the rectangle contained by the side...
Side 137 - In every triangle, the square of the side subtending either of the acute angles is less than the squares of the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the perpendicular let fall upon it from the opposite angle, and the acute angle.