 | Euclides - 1883 - 176 pages
...of the lines is perpendicular to the other, or at right angles to the other. 8. An obtuse angle (A) is that which is greater than a right angle. 9. An acute angle (B) is that which is less than a right angle. 10. A figure is that which is enclosed by one or more... | |
 | Euclid, Isaac Todhunter - Euclid's Elements - 1883 - 428 pages
...called a perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which \ is less than a right angle. 13. A term or boundary is the extremity of any thing. 14. A figure is that which is enclosed by one... | |
 | Joseph Hughes - Education - 1883 - 568 pages
...inclination of two lines to one another in » plane which meet together, but are not in the same direction. A figure is that which is enclosed by one or more boundaries. A square is a four-sided figure having all its sides equal, and »И its angles right angles. A parallelogram... | |
 | Mathematical association - 1883 - 86 pages
...15. A perpendicular to a straight line is a straight line that makes a right angle with it. DEF. 16. An acute angle is that which is less than a right angle. DEF. 17. An obtuse angle is that which is greater than one right angle, but less than two right angles.... | |
 | Education - 1883 - 654 pages
...inclination of two lines to one another in » plane which meet together, but are not in the same direction. A figure is that which is enclosed by one or more boundaries. A square is a four-sided figure having all its sides equal, and ill its angles right angles. A parallelogram... | |
 | Mathematical association - 1884 - 146 pages
...perpendicular to a straight line is a straight line that makes a right angle with it. C 18 DEF. 1 2. An acute angle is that which is less than a right angle. DEF. 13. An obtuse angle is that which is greater than one right angle, but less than two right angles.... | |
 | Association for the improvement of geometrical teaching - Geometry, Modern - 1884 - 150 pages
...n. A perpendicular to a straight line is a straight line that makes a right angle with it. DEF. 1 2. An acute angle is that which is less than a right angle. DEF. 13. An obtuse angle is that which is greater than one right angle, but less than two right angles.... | |
 | Stephen Thomas Hawtrey - 1884 - 184 pages
...following definitions: Definition 13.—A term or boundary is the extremity of anything. Definition 14.—A figure is that which is enclosed by one or more boundaries. The ' figure' so introduced is the Circle, which is thus defined: Definition 15.—A circle is a plane... | |
 | Euclides - 1884 - 182 pages
...called a perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which is less than a right angle. 'Adjacent' means lying next to, from the Latin ad, to, and/awo, I lie. Adjacent angles have one of... | |
 | Stewart W. and co - 1884 - 272 pages
...acute angle if less than a right angle. XIII. A term or boundary is the extremity of anything. XIV. A figure is that which is enclosed by one or more boundaries. XV. A circle is a plane figure contained by one line, called the circumference, such that all straight... | |
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... angles is called a right angle ; and the straight line which stands on the other is called a perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. 12. An acute angle is that which is less than a right angle. 13. A term... 
