Exercises on Euclid and in modern geometry for the use of schools, private students, and junior university students (1881)
McDowell, James L · Cambridge, Deighton, Bell, and Co. · leaf 138
Fir. i Kg. In Figs. 1 and 2 let AB and CD be the bases of triangles withcommon vertex O. Through 0 draw OFF parallel to AB, meetingthe sides BC and AD (produced, if necessary) in E and F. The triangle AOB is half the parallelogram BF (I. 41), andthe triangle COD is half the parallelogram CF.…
Geometry
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