Practical Geometry on an Entirely New Plan ...


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Δημοφιλή αποσπάσματα

Σελίδα 5 - A circle is a plane figure bounded by a curved line called the circumference, every point of which is equally distant from a point within called the center, Fig.
Σελίδα 5 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees; and each degree into 60 minutes, each minute into 60 seconds, and so on. Hence a semicircle contains 180 degrees, and a quadrant 90 degrees.
Σελίδα 66 - Four magnitudes are in harmonical proportion when the first is to the fourth as the difference between the first and second is to the difference between the third and fourth.
Σελίδα 66 - Three lines are in harmonical proportion, when the first is to the third, as the difference between the first and second, is to the difference between the second and third ; and the second is called a harmonic mean between the first and third. The expression 'harmonical proportion...
Σελίδα 147 - A sphere is a solid, bounded by a curved surface, every part of which is equally distant from a point within, called the centre.
Σελίδα 4 - Other polygons include the quadrilateral (4 sides), pentagon (5 sides ) , hexagon ( 6 sides ) , heptagon ( 7 sides ) , octagon ( 8 sides ) , nonagon ( 9 sides ) , decagon ( 10 sides ), and dodecagon ( 12 sides).
Σελίδα 148 - The axis of a solid is a line drawn from the middle of one end to the middle of the opposite end ; as between the opposite ends of a prism.
Σελίδα 112 - To ßnd the area of a triangle. Rule 1. Multiply the base by the perpendicular height, and take half the product for the area. Or multiply either of these dimensions by half the other.
Σελίδα 27 - BI includes a short horizontal line between stanzas 1 and 2, 3 and 4, 5 and 6, and 7 and 8.
Σελίδα 2 - A Right angle is that which is made by one line perpendicular to another. Or when the angles on each side are equal to one another, they are right angles.

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