## First book of mathematics |

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### Common terms and phrases

ABCD acres acute angle added algebra altitude angle equal angular points base Bisect called centre chord circle circumference construct contained denotes diagonal diameter difference distance divide division divisor draw drawn edge ends equal equation equidistant Exercises expressed feet field figure Find the area foot formula four geometrical given angle given line given point given straight line given triangle gives half hypotenuse inches inscribed known length less letters mark means measure meet multiply Note number of degrees opposite angles opposite side parallel parallel lines parallelogram perpendicular placed plane poles Problem produced proportion quadrilateral quantity radius ratio rectangle regular polygon respects right angles right-angled triangle rood round rule sides similar square square root stands straight line subtracted surface taken tangent term third trapezoid usually whole yards

### Popular passages

Page 9 - The circumference of every circle is supposed to be divided into...

Page 52 - UPON a given straight line to describe a segment of a circle containing an angle equal to a given rectilineal angle.

Page 7 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.

Page 43 - Parallelograms on the same base, and between the same parallels, are equal to one another.

Page 63 - Quadrilateral ; of five sides a Pentagon ; of six sides a Hexagon ; of seven sides a Heptagon ; of eight sides an Octagon ; of nine sides a Nonagon ; of ten sides a Decagon ; of twelve sides a Dodecagon.

Page 116 - Polygons are those which have more than four sides. They receive particular names from the number of their sides ; thus a pentagon has five sides, a hexagon has six sides, a heptagon seven, an octagon eight, a nonagon nine, a decagon ten, an undecagon eleven, and a dodecagon has twelve sides.

Page 122 - Divide the area by . 7854 and extract the square root of the quotient.

Page 86 - To rearrange an equation you can • add the same quantity to both sides • subtract the same quantity from both sides • multiply both sides by the same quantity • divide both sides by the same quantity.

Page 111 - Find the area of a field in the form of a trapezoid whose altitude is 120 m and whose parallel sides are 130 m and 180 m.

Page 8 - It is a line every point of which is at the same distance from a point within it called the centre.