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An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF.
The Complete Arithmetic - Σελίδα 197
των Milton Browning Goff - 1876 - 452 σελίδες
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## Elements of Geometry and Conic Sections

Elias Loomis - 1849 - 252 σελίδες
...called a right angle, and the straight line which meets the other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle....angle is one which is greater than a right angle. in the same plane, and which, being produced 12. Parallel straight lines are such as are 13. A plane...

## An Introductory Treatise on Mensuration in Theory and Practice ...

John Radford Young - 1850 - 294 σελίδες
...adjacent angle, that would be formed by producing one of the sides beyond the vertex, be equal to it. 7. An ACUTE ANGLE is one which is less than a right angle. 8. An OBTUSE ANGLE is one which is greater than a right angle. Therefore, angles are of three kinds:...

## High School Arithemtic: Containing the Elementary and the Higher Principles ...

James B. Dodd - 1852 - 410 σελίδες
...Thus if the two angles ABC and 0 BD are equal to each, other, each of them is a risht angle. CE AM An acute angle is one which is less than a right angle, as the angle CBE ; and an obtuse angle is one which is greater than a right angle, as the angle ABE....

## High School Arithmetic

James B. Dodd - 1853 - 398 σελίδες
...line. Thus if the two angles ABC and CBD are equal to each other, each of them is a right angle. Ji An acute angle is one which is less than a right angle, as the angle CBE; and an obtuse angle is one which is greater than a right angle, as the angle ABE....

## The Practical Draughtsman's Book of Industrial Design: Forming a Complete ...

Jacques Eugène Armengaud (the Elder.), William Johnson - 1853 - 416 σελίδες
...when, however, they cross each other without being perpendicular, they form acute or obtuse angles. An acute angle is one which is less than a right angle, as F c D, fig. 2 ; and an obtuse angle is greater than a right angle, as GC D. By angle is generally...

## the practical draughtsman's book of industrial design, and machinist's and ...

william johnson - 1854 - 212 σελίδες
...when, however, they cross each other without being perpendicular, they form acute or obtuse angles. An acute angle is one which is less than a right angle, as F c D, fig. 2 ; and an obtuse angle is greater than a right angle, as G c D. By angle is generally...

## Plane and Solid Geometry: To which is Added Plane and Spherical Trigonometry ...

George Roberts Perkins - 1856 - 460 σελίδες
...these angles is called a Sight angle, and the lines are said to be perpendicular to each other. XIII. An Acute angle is one which is less than a right angle. XIV. An Obtuse angle is one which is greater \ than a right angle. XV. When the sum of two angles is...

## Elements of Geometry and Conic Sections

Elias Loomis - 1858 - 256 σελίδες
...called a right angle, and the straight line which meets the other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle....angle is one which is greater than a right angle. 12. Parallel straight lines are such as are in the same plane, and which, being produced ever so far...

## Elements of Geometry and Conic Sections

Elias Loomis - 1860 - 246 σελίδες
...of the two angles BCE, ECD; and the angle ECD is the difference between the two angles BCD, BCE. 11. An acute angle is one which is less than a right angle. . An obtuse angle is one which \e greater than a right angle. in the same plane, and which, being produced 12. Parallel .straight...

## The practical draughtsman's book of industrial design, tr. from ..., Τεύχος 60

William Johnson - 1860 - 442 σελίδες
...such lines meet or cross each other without being perpendicular, they form acute or obtuse angles. An acute angle is one which is less than a right angle, as F с n, Fig. 8; ami an obtuse angle is greater than a right angle, as o с D. By angle is generally...