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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 - 226 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 - 12 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 - 362 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
...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 ...

Armengaud (aîné, Jacques-Eugène), William Johnson - 1853 - 196 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
...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

GEORGE R. PERKINS - 1856
...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 - 234 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 - 234 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
...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...