## A Treatise on Mensuration, Both in Theory and Practice |

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Page 91

Multiply the

be the area . That is , AB X AC = the area . Note . Because the

is equal to its height , its area will be found by multiplying the side by itself .

Multiply the

**length**by the height or perpendicular breadth , and the product willbe the area . That is , AB X AC = the area . Note . Because the

**length**of a squareis equal to its height , its area will be found by multiplying the side by itself .

Page 123

To find the

degrees in the arc , So is 3-1416 times the radius , to its

number of degrees in the arc , So is .0174533 times the radius , to its

To find the

**Length**of any Arc of a Circle 1. * RU LE As 180 is to the number ofdegrees in the arc , So is 3-1416 times the radius , to its

**length**. • Or as 9 is to thenumber of degrees in the arc , So is .0174533 times the radius , to its

**length**. Page 191

If the

equal to half a prism of the same base and height , or equal to half the product of

the base and height . EXAMPLE I. How many folid feet are in a wedge whose

base ...

If the

**length**of the edge be equal to the**length**of the base , the wedge will beequal to half a prism of the same base and height , or equal to half the product of

the base and height . EXAMPLE I. How many folid feet are in a wedge whose

base ...

Page 216

From the square of half the

the zone ; from the product fubtract the product of the generating circular area ,

and ...

From the square of half the

**length**of the spindle , take of the square of half the**length**of the middle zone ; and multiply the remainder by the said half .**length**ofthe zone ; from the product fubtract the product of the generating circular area ,

and ...

Page 612

In roofing , the

of one gable , is to be considered as the

double the

and ...

In roofing , the

**length**of the house in the in Gide , together with į of the thicknessof one gable , is to be considered as the

**length**; and the breadth is equal todouble the

**length**of a string which is stretched from the ridge down the rafter ,and ...

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### Common terms and phrases

abſciſs alſo altitude angle baſe become breadth called caſk circle circumference common cone conjugate conſequently Corol corollary curve DEMONSTRATION deſcribe diameter difference diſtance divided double draw drawn ellipſe equal evident EXAMPLE feet fides figure firſt fixed folidity fruſtum gallons give given greater half height hence hyperbola inches laſt length leſs mean meaſure method middle multiply muſt nearly Note oppoſite ordinate parabola parallel perpendicular places plane prob PROBLEM proportional putting quantity quotient radius remainder root rule ſaid ſame ſection ſegment ſeries ſet ſhall ſide ſimilar ſolid ſphere ſpheroid ſpindle ſquare ſtation ſum ſuppoſing ſurface taken tangent theſe thoſe triangle uſed verſed whole whoſe yards zone

### Popular passages

Page 535 - ... being entirely dependent on them, and therefore they should be taken of as great length as possible ; and it is best for them to run along some of the hedges or boundaries of one or more fields, or to pass through some of their angles. All things being determined for these stations, you must take more inner stations, and continue to divide and subdivide, till at last you come to single fields ; repeating the same work for the inner stations as for the outer ones, till the whole is finished.

Page 91 - The area of a rectangle is equal to the product of its base and altitude. Given R a rectangle with base b and altitude a. To prove R = a X b. Proof. Let U be the unit of surface. .R axb U' Then 1x1 But - is the area of R.

Page 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.

Page 614 - ... for the double row of slates at the bottom, or for how much one row of slates or tiles is laid over another. When the roof is of a true pitch, that is, forming a right angle at top ; then the breadth of the building, with its half added, is the girt over both sides nearly.

Page 617 - The length of a room being 20 feet, its breadth 14 feet 6 inches, and height 10 feet 4 inches ; how many yards of painting are in it, deducting a...

Page 6 - A quadrant, or quarter of a circle, is a sector, having a quarter of the circumference for its arc, and the two radii are perpendicular to each other, as G.

Page 608 - Chimneys are commonly measured as if they were solid, deducting only the vacuity from the hearth to the mantle, on account of the trouble of them. All windows, doors, &c, are to be deducted out of the contents of the walls in which they are placed.

Page 62 - From the edge of a ditch 18 feet wide, surrounding a fort, I took the angle of elevation of the top of the wall and found it 62° 40...

Page 7 - The Measure of an angle, is an arc of any circle contained between the two lines which form that angle, the angular point being the centre ; and it is estimated by the number of degrees contained in that arc.

Page 461 - Ans. the upper part 13'867. the middle part 3 '605. the lower part 2-528. QUEST. 48. A gentleman has a bowling green, 300 feet long, and 200 feet broad, which he would raise 1 foot higher, by means of the earth to be dug out of a ditch that goes round it : to what depth must the ditch be dug, supposing its breadth to be every where 8 feet i Ans. 7f-| feet. QUEST. 49. How high above the earth must a person be raised, that he may see j. of its surface ? Ans. to the height of the earth's diameter.