## A Royal Road to Geometry: Or, an Easy and Familiar Introduction to the Mathematics. ... By Thomas Malton. ... |

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Page 236

are made use of , they only denote Quantity , simply , but in what Ratio , or

expressive to those who are not well versed in them ; they do not convey an Idea

adequate ...

are made use of , they only denote Quantity , simply , but in what Ratio , or

**Proportion**, is best expressed by Numbers ; algebraic Characters are not soexpressive to those who are not well versed in them ; they do not convey an Idea

adequate ...

Page 241

Definition , say , “

Definition , calls

Definition , say , “

**Proportion**is a fimilitude of Ratios , " which , if Ratio and**Proportion**be the fame , ( as the Doctor affirms , in 2 ... Dr. Keil , in his sthDefinition , calls

**Proportion**Analogy , and says , “ Analogy is a liniilitude oi**Proportions**; and ... Page 242

Analogy , applied to Ratios , is , at least to me , very expressive of the thing meant

by it ; much more fo , in my opinion , than

for Ratio , or Ratio for

Analogy , applied to Ratios , is , at least to me , very expressive of the thing meant

by it ; much more fo , in my opinion , than

**Proportion**; which is only another Termfor Ratio , or Ratio for

**Proportion**; which , Terms , are fynonimous , and equally ... Page 246

A Righé Line is faid to be divided in extreme and mean

cut into two unequal Parts , the Ratio of the whole Line , to the greater Segment ,

is the same as of the greater Segment to the less . If the Line AB be cut in C. A С ...

A Righé Line is faid to be divided in extreme and mean

**Proportion**; when , beingcut into two unequal Parts , the Ratio of the whole Line , to the greater Segment ,

is the same as of the greater Segment to the less . If the Line AB be cut in C. A С ...

Page 250

The Doctrine of

it Thould be together , in one Book ; which , according to Euclid , is the fifth : to

which in the use and application of it , in the sixth and other Books , ) we may

refer ...

The Doctrine of

**Proportion**is a distinct fubject , and therefore , all which relates toit Thould be together , in one Book ; which , according to Euclid , is the fifth : to

which in the use and application of it , in the sixth and other Books , ) we may

refer ...

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### Common terms and phrases

ABCD added alſo Altitudes analogous Area Baſe becauſe biſected Book called Center Chord Circle Circumference common Cone conf conſequently Conſtruction contained cuting Cylinder Demonſtration deſcribe Diagonal Diameter difference divided draw drawn equal Euclid evident extreme fame Feet Figure firſt formed four fourth given given Line greater half Hence Inches inſcribed join laſt leſs manner mean meaſure multiplied muſt oppoſite parallel Parallelogram Parallelopiped Pentagon perpendicular Plane Point Poligon Priſm Prob PROBLEM produced Proportion Propoſition proved Pyramid Quantities Radius Ratio Rect Rectangle reſpectively Right Angles Right Line ſame ſame Ratio ſay ſeeing Segment Sides ſimilar Solid ſome Sphere Square ſuch Surface taken Terms THEOREM third thoſe touch Triangle uſe wherefore whole whoſe

### Popular passages

Page 124 - When you have proved that the three angles of every triangle are equal to two right angles...

Page 221 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.

Page 285 - EG, let fall from a point in the circumference upon the diameter, is a mean proportional between the two segments of the diameter DS, EF (p.

Page 284 - IN a right-angled triangle, if a perpendicular be drawn from the right angle to the base, the triangles on each side of it are similar to the whole triangle, and to one another.

Page 186 - From this it is manifest, that if one angle of a triangle be equal to the other two, it is a right angle, because the angle adjacent to it is equal to the same two; and when the adjacent angles are equal, they are right angles.

Page 248 - To express that the ratio of A to B is equal to the ratio of C to D, we write the quantities thus : A : B : : C : D; and read, A is to B as C to D.

Page 161 - In any triangle, if a line be drawn from the vertex at right angles to the base; the difference of the squares of the sides is equal to the difference of the squares of the segments of the base.

Page 160 - In any isosceles triangle, the square of one of the equal sides is equal to the square of any straight line drawn from the vertex to the base plus the product of the segments of the base.

Page 250 - Ratios that are the same to the same ratio, are the same to one another. Let A be to B as C is to D ; and as C to D, so let E be to F.

Page 124 - Angles, taken together, is equal to Twice as many Right Angles, wanting four, as the Figure has Sides.