Construct an isosceles triangle of given base and altitude with compass and straightedge
(For assistance see www.mathopenref.com/constisosceles2.html)
1. Construct an isosceles triangle whose base is equal in length (congruent to) the segment FG, and whose altitude (height) is congruent to AB.
2. (a) Construct two isosceles triangles with base CD and altitude AB, which share a common base,
as shown in the example. (Hint: some of the construction needs only be done once)