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 113
s and equal altitudes,they must all be equal in area toeach other. Problem 127. To transform a given trapezium ABDC into anequivalent triangle. Join BC. From D draw the line DE parallel to CB till itmeets AB produced in E (Prob.4). Join CE. Then ACE willbe the triangle required. We have simply… … 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.…
Geometrical drawing
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