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" If the angle be less than a right angle, it is called an acute angle ; if more, it is called an obtuse angle. "
Introduction to Linear Drawing - Σελίδα 4
των Louis-Benjamin Francœur, William Bentley Fowle - 1825 - 64 σελίδες
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A Hand-book, Or, Concise Dictionary of Terms Used in the Arts and Sciences

Walter Hamilton (M.R.A.S.) - 1825 - 451 σελίδες
...blunt, not pointed, in opposition to acute or sharp. OBT OCH OBTUSE ANGLE. In Geometry, if the contained angle be less than a right angle, it is called an acute; if greater, it is called an obtuse angle. OBUMBRATION (from obrumbo, Lat.) In Astronomy, the art of...

The Eye and Hand: Being a Series of Practical Lessons in Drawing, for the ...

William Bentley Fowle - 1849 - 94 σελίδες
...angle, because the opening will only be the same part of a great circle that it was of a small one. (9) (10) Imagine two lines which cross each other...turned upward, downward, to the right, and to the left. % 23. Make a triangle, (fig. 11.) Close the space between the sides of an angle with a right 'line,...

The Mechanic's Assistant: A Thorough Practical Treatise on Mensuration and ...

D. M. Knapen - 1849 - 276 σελίδες
...ABC, or the angle at B, in the above figure, is a right angle. If the space included between two lines be less than a right angle, it is called an acute angle ; but if the space be greater than a right angle, it is called an obtuse angle. The rules for drawing...

Rudimentary Dictionary of Terms Used in Architecture: Civil, Architecture ...

John Weale - 1859 - 596 σελίδες
...Obtuxe, in geometry, blunt ; in opposition to acute or sharp Obtuse angle. In geometry, if the contained angle be less than a right angle, it is called an acute; if greater, it is called an obtuse angle. Obttae -angled triangle, a triangle which has an obtuse angle...

First Principles of Physics: Or Natural Philosophy, Designed for the Use of ...

Benjamin Silliman - 1859 - 720 σελίδες
...Isosceles Triangle has two equal sides which may contain either a right, an acute or obtuse angle ; if the angle be less than a right angle it is called an acute triangle, if greater, an obtuse triangle. The unequal side of an isosceles triangle is called the base....




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