If one straight line meet another and the angles thus formed are equal they are right angles. When two 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... Mechanical Drawing: Instruction Paper - Page 42by Ervin Kenison - 1916 - 71 pagesFull view - About this book
| Linus Faunce - Mechanical drawing - 1887 - 176 pages
...less than a right angle. An obtuse angle is more than a right angle. A quadrant is an arc of 90°. A plane figure is a plane bounded on all sides by lines. If the lines are straight, the space which they contain is called a rectilinear figure or polygon,... | |
| Linus Faunce - Mechanical drawing - 1890 - 172 pages
...less than a right angle. An obtuse angle is more than a right angle. A quadrant is an arc of 90°. A plane figure is a plane bounded on all sides by lines. If the lines are straight, the space which they contain is called a rectilinear figure or polygon,... | |
| 1902 - 486 pages
...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...lines) is called a polygon or a rectilinear figure. TRIANGLES. A triangle is a figure enclosed by three straight lines. It is a polygon of three sides.... | |
| American School (Chicago, Ill.) - Engineering - 1903 - 416 pages
...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...straight lines) is called a polygon or a rectilinear fignre. TRIANGLES. A triangle is a figure enclosed by three straight lines. It is a polygon of three... | |
| American School (Chicago, Ill.) - Engineering - 1906 - 586 pages
...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...these lines (if they are straight lines) is called a polggon or a rectilinear figure. TRIANGLES. A triangle is a figure enclosed by three straight lines.... | |
| American School (Lansing, Ill.) - Architectural drawing - 1906 - 426 pages
...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...straight lines) is called a polygon or a rectilinear fyure. TRIANGLES. A triangle is a figure enclosed by three straight lines. It is a polygon of three... | |
| American School (Chicago, Ill.) - Engineering - 1906 - 580 pages
...line; it has two dimensions, — length and hreadth. A plane figure is a plane bounded on all sides hy lines; the space included within these lines (if they...lines) is called a polygon or a rectilinear figure. TRIANGLES. A triangle is a figure enclosed by three straight lines. It is a polygon of three sides.... | |
| Drawing - 1906 - 424 pages
...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. A plane figure is a plane bounded on all sides by lines; the space... | |
| American School (Lansing, Ill.) - Architecture - 1907 - 360 pages
...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...lines) is called a polygon or a rectilinear figure. TRIANGLES. A triangle is a figure enclosed by three straight lines. It is a polygon of three sides.... | |
| American School of Correspondence - Civil engineering - 1908 - 474 pages
...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...lines) is called a polygon or a rectilinear figure. TRIANGLES. A triangle is a figure enclosed by three straight lines. It is a polygon of three sides.... | |
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