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" 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 42
by Ervin Kenison - 1916 - 71 pages
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Mechanical Drawing: Prepared for the Use of the Students of the ...

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,...
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Mechanical Drawing.pbPrepared for the Use of the Students of the ...

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,...
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Cyclopedia of Engineering; a Complete Manual of Steam and Machine ..., Volume 4

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....
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Mechanical drawing

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...
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Modern Engineering Practice: A Reference Library..., Volume 11

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....
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Cyclopedia of Drawing, Volume 1

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...
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Modern Engineering Practice: A Reference Library..., Volume 11

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....
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Cyclopedia of Drawing: A General Reference Work on Drawing and ..., Part 1

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...
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Cyclopedia of Architecture, Carpentry and Building, Volume 6

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....
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Cyclopedia of Civil Engineering: Plane surveying; mechanical drawing

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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