Lessons On Form: Or, An Introduction to Geometry, As Given in a Pestalozzian ...
Lessons On Form: Or, An Introduction to Geometry, As Given in a Pestalozzian ...
Reiner, C
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^s? P. — ^If their sum be less, b a and c d must meet toward the points c and d; and if their sum be greater than 2 rt. ^s, the lines d a and c b will not meet. M, — In the former case, the lines da and c & are said 62 LESSONS ON FORM, BEING to converge towards e and d ; and, in the latter case, they are said to diverge, M. — If three lines, intersecting each other in two points, make eight angles, what is their sum ? P. — Their sum is equal to 8 rt. ^s. M. — If three lines meet and intersect e...ach other in three points, what is the least, and what is the great- est, number of angles they make ? 41 P. — The least number is angles ; and the greatest number ^gles. ^_^ ^_^ ' M, — What do you observe respecting these lines ? P. — They inclose a space — they form a triangle. SUBSTANCE OF THIS SECTION. 18. If two parallel lines intersect another straight line, they make the exterior angle equal to the interior and opposite angle. 19. If two parallel lines intersect another straight line, they make the alternate angles equal to each other.
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