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An ACUTE ANGLE is one which is less than a right angle ; as the angle DEF.
Stories about Mathematics-land - Page 73
by D. Ponton - 1927

## Elements of Geometry and Conic Sections

Elias Loomis - Conic sections - 1849 - 252 pages
...other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle. An obtuse 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 - Measurement - 1850 - 294 pages
...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: — right, acute, and obtuse. 9. A PLANE TRIANGLE is a. figure...

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

James B. Dodd - Arithmetic - 1852 - 410 pages
...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. § 37§. One straight line is perpendicular to another when they form a right angle...

## High School Arithmetic

James B. Dodd - 1853 - 398 pages
...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. § 379. Two straight lines are parallel to each other when they are everywhere equidistant...

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

Charles Armengaud, William Johnson - Architectural drawing - 1853 - 416 pages
...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 pages
...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 - Geometry - 1856 - 460 pages
...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 equal to a right angle, they are called Complementary angles ; each...

## Elements of Geometry and Conic Sections

Elias Loomis - Conic sections - 1858 - 256 pages
...other is called a perpendicular to it. 11. An acute angle is one which is less than a right angle. An obtuse 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...