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Contents

 Section 1 1 Section 2 4 Section 3 6 Section 4 7 Section 5 8 Section 6 17 Section 7 32 Section 8 37
 Section 15 2 Section 16 3 Section 17 4 Section 18 6 Section 19 7 Section 20 9 Section 21 10 Section 22 11

 Section 9 44 Section 10 63 Section 11 86 Section 12 112 Section 13 113 Section 14 1
 Section 23 12 Section 24 13 Section 25 14 Section 26 15 Section 27 16 Section 28

Popular passages

Page 18 - If two triangles have two sides of the one equal to two sides of the...
Page 67 - To a given straight line to apply a parallelogram, which shall be equal to a given triangle, and have one of its angles equal to a given rectilineal angle.
Page 51 - That, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
Page 109 - ... subtending the obtuse angle, is greater than the squares of the sides containing the obtuse angle, by twice the rectangle contained by the side upon which, when produced, the perpendicular falls, and the straight line intercepted without the triangle between the perpendicular and the obtuse angle. Let ABC be an obtuse-angled triangle, having the obtuse angle ACB, and from the point A let AD be drawn perpendicular to BC produced.
Page 12 - Mrs. R. Lee's Elements of Natural History ; or, First Principles of Zoology : Comprising the Principles of Classification, interspersed with amusing and instructive Accounts of the most remarkable Animals.
Page 53 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line ; it is required to draw a straight line E iR.
Page 76 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Page 34 - ABD, the less to the greater, which is impossible ; therefore BE is not in the same straight line with BC. And in like manner, it may be demonstrated, that no other can be in the same straight line with it but BD, which therefore is in the same straight line with CB.
Page 11 - LET it be granted that a straight line may be drawn from any one point to any other point.
Page 37 - Any two angles of a triangle are together less than two right angles. Let ABC be any triangle ; any two of its angles together are less than two right angles.