Sullivan, Christine [Gordon]. [from old catalog] · New York, Cincinnati [etc.] American book company · leaf 16
Isosceles. Scalene. Fig. 13.—Triangles. 28. An equilateral triangle has all sides equal. 29. A right-angled triangle is one that has a right angle. 30. An isosceles triangle has two sides equal. 31. A scalene triangle has no two sides equal. 32. An equiangular triangle is called a trigon. 33.…
Mechanical drawing
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