Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 114
Fig. 205. Problem 128. To convert a given regular pentagon ABEDC into a trapezium, orto construct an isosceles triangle of an area equal to that ofa given pentagon. Join A and B to D. From point E draw the line EH EQUIVALENT AREAS 93 parallel to DB till it meetsAB produced in H (Prob. 4).Join DH.… … Fig. 206. Problem 129. To clrcao a triangle equivalent to any rectilinear figure, forexample an irregular hexagon ACDEFB. Join DA. From C draw CH parallel to DA to meet ABproduced in H (Prob. 4). Join DH. We now have an ir-regular pentagon HDEFBequivalent to the givenhexagon. Join EB. From F drawFK…
Geometrical drawing
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