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" ... angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it. XL An obtuse angle is that which is greater than a right angle. XII. An acute angle is that which is less than a right angle. XIII. "... "
First (Second) book of drawing (by J. Clark). - Σελίδα 12
των John Clark (drawing master.) - 1840
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...is the angle of ABC. " I An (tht use Angle is that which is greater than a right A ' angle, as ABC. An Acute Angle is that which is less than a right angle, asDBC. By an ANGLE of ELEVATION is meant the angle contained between a line of direction, and any plane...

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...called a perpendicular to it. 11. An obtuse angle is that which is greater than a right angle. ^ 12. An acute angle is that which is less than a right angle. 13. " A term or boundary is the extremity of any thing." 14. A figure is that which is inclosed by...




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