 | Joseph Ray - Arithmetic - 1903 - 366 pages
...straight lines are perpendicular to each other, they form a right angle. An acute angle is less than a right angle. An obtuse angle is greater than a right angle. When two straight lines are everywhere equally distant they are parallel. A surface has length and... | |
 | American School (Lansing, Ill.) - Architectural drawing - 1906 - 426 pages
...lines are perpendicular to each other the angles formed are right angles. An acute angle is less than a right angle. An obtuse angle is greater than a right angle. SURFACES. A surface is produced hy the motion of a line; it has two dimensions, — length and breadth.... | |
 | Drawing - 1906 - 424 pages
...lines are perpendicular to each other the angles formed are right angles. An acute angle is less than a right angle. An obtuse angle is greater than a right angle. SURFACES. A surface is produced by the motion of a line; it has two dimensions,—length and breadth.... | |
 | American School (Chicago, Ill.) - Engineering - 1906 - 580 pages
...lines are perpendicular to each other the angles formed are right angles. An acute angle is less than a right angle. An obtuse angle is greater than a right angle. SURFACES. A surface is produced hy the motion of a line; it has two dimensions, — length and hreadth.... | |
 | Walter Crady - Teachers - 1906 - 274 pages
...A right angle is formed by a line perpendicular to another line: |_. An acute angle is smaller than a right angle: <. An obtuse angle is greater than a right angle. A parallelogram is a quadrilateral with two pairs parallel sides. A rectangle is a right angled parallelogram.... | |
 | American School (Lansing, Ill.) - Architecture - 1907 - 360 pages
...lines are perpendicular to each other the angles formed are right angles. Au acute angle is less than a right angle. An obtuse angle is greater than a right angle. SURFACES. A surface is produced by the motion of a line; it has two dimensions, — length and breadth.... | |
 | James Lawrence Nichols - Business - 1907 - 456 pages
...other so as to form four equal angles, each angle is called a right angle. An acute angle is less than a right angle. An obtuse angle is greater than a right angle. A triangle is a figure having three sides. A surface having four straight lines and four right angles... | |
 | American School of Correspondence - Civil engineering - 1908 - 474 pages
...lines are perpendicular to each other the angles formed are right angles. An acute angle is less than a right angle. An obtuse angle is greater than a right angle. SURFACES. A surface is produced by the motion of a line; it has two dimensions, — length and breadth.... | |
 | Architecture - 1909 - 468 pages
...lines are perpendicular to each other the angles formed are right angles. An acute angle is less than a right angle. An obtuse angle is greater than a right angle. SURFACES. A surface is produced by the motion of a line; it has two dimensions, — length and breadth.... | |
 | George William Myers - Mathematics - 1909 - 394 pages
...straight angle, or the angle made by a quarter-turn of a rotating line. 4. An acute angle is less than a right angle. An obtuse angle is greater than a right angle and less than a straight angle. 5. A decree is one-nintieth of a right angle. 6. Two angles are adjacent... | |
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An acute angle is less than a right angle. An obtuse angle is greater than a right angle. 
