## Elements of geometry and mensuration |

### From inside the book

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**right angle**, or CG is perpendi- cular to AB ( 10 ) . 30. PROP . VIII . The two angles which one straight line makes with another upon the one side of it are always equal to two**right angles**. Let the straight line CD meet the ... Page 21

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**right angles**, AC , and CB , are in one and the same straight line . COR . 2. Hence , also , whatever be the number of angles in one plane , separate and distinct , on one side of AB , with a common vertex C , the sum of all these ... Page 23

... angles on the same side of the intersecting line are together equal to two

... angles on the same side of the intersecting line are together equal to two

**right angles**, the two straight lines shall be parallel . For , since BEF + BEG = two**right angles**( 30 ) , .. BEF + ‹ BEG = △ BEF + △ EFD , and ... BEG = EFD ... Page 24

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**right angles**to the other . This is obvious from Cor . 2 . COR . 4. The converse of both the original propo- sition ... angles are equal to one another ; and the exterior angle is equal to the in- terior and opposite upon the same ... Page 25

... right E angles to CD ( 28 ) ; produce EC to any point F ; then EF is parallel to AB and is drawn through C ( 34 ... angles of the triangle ; and the three interior angles of every triangle are equal to two

... right E angles to CD ( 28 ) ; produce EC to any point F ; then EF is parallel to AB and is drawn through C ( 34 ... angles of the triangle ; and the three interior angles of every triangle are equal to two

**right angles**. Let the ...### Other editions - View all

### Common terms and phrases

ABCDEF acres base bisect breadth centre chain chord circular circum circumference circumscribing circle compasses construction contained continued fraction curved decimal Diagonal Scale diagram diameter distance divided draw drawn edge equilateral triangle find the area find the length fraction frustum given angle given circle given line given point given straight line given triangle half height Hence hexagon inscribed instrument intersecting join Let ABCD lineal unit magnitude meet multiplied number of equal number of sides number of units opposite angle parallelogram perimeter perpendicular plane surface plot points of division PROB produced PROP proportional Protractor radii radius ratio rectangle rectangular regular polygon represent right angles shew shewn similar similar triangles square feet square foot square inches straight edge subtends suppose trapezium triangle ABC vernier vertex whole yards

### Popular passages

Page 32 - If a straight line be divided into any two parts, the square of the whole line is equal to the squares of the two parts, together with twice the rectangle contained by the parts.

Page 19 - To draw a straight line at right angles to a given straight line, from a given point in the same.

Page 27 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.

Page 32 - If the square described upon one of the sides of a triangle, be equal to the squares described upon the other two sides of it; the angle contained by these two sides is a right angle.

Page 43 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.

Page 17 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.

Page 22 - Theorem. The greater side of every triangle is opposite to the greater angle. Let ABC be a triangle of which the side AC is greater than the side AB ; the angle ABC is also greater than the angle BCA. Because AC is greater than AB, make...

Page 192 - The circumference of every circle is supposed to be divided into 360 equal parts called degrees, and each degree into 60 equal parts called minutes, and each minute into 60 equal parts called seconds, and these into thirds, fourths, &c.

Page 126 - Upon a given straight line to describe a segment of a circle, which shall contain an angle equal to a given rectilineal angle.

Page 20 - To draw a straight line perpendicular to a given straight line of an unlimited length, from a given point without it.