Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . Example S,—Draw an equilateral triangle, each side 4, oneside on ground plane parallel to ; triangle placed _|_ toground plane and touching 3 to right. Draw , and , and find M. Take point D 3to R., and B 3^ to right of D ; on DB describe the equilateraltriangle DGB. Bisect DB in E, join EG; through G drawFH parallel to , and through D, B draw DF, BH parallelto EG, cutting FH in F, H. Join B , draw EM, DM,cutting B C. Y. in N and A. With centre B
Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . Example S,—Draw an equilateral triangle, each side 4, oneside on ground plane parallel to ; triangle placed _|_ toground plane and touching 3 to right. Draw , and , and find M. Take point D 3to R., and B 3^ to right of D ; on DB describe the equilateraltriangle DGB. Bisect DB in E, join EG; through G drawFH parallel to , and through D, B draw DF, BH parallelto EG, cutting FH in F, H. Join B , draw EM, DM,cutting B C. Y. in N and A. With centre B and distance BHdescribe arc HK, cutting BK, a perpendicular on , at K; THE TRIANGLE. 43 join K Through A and N draw parallels to BK, meet-ing K in L and C; join AC, CB. Then ABC is thetriangle required. For LA = CIvT = KB = BH = EG = altitudeof the triangle; and AN = NB = DE = EB, and AB = DB =. length of side; then C corresponds to G, and AC, CB to DGand GB respectively. (Fig. 24.) Example 4-—Draw a right angled-triangle whose hypothenuse is 4 and one of the other sides 3; the right angle is 44 BRAWINa directed away from the observer, and is 5^ to the left, andthe hypothenuse is 3 to the left. The triangle lies on theground with the hypothenuse in contact with the
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Keywords: ., bookcentury1800, booksubjectgeometricald, booksubjectperspective
