What occurred at the berlin conference of 1884

European nations were invited to decide how to divide up the continent of Africa for colonization.

Explanation:

Regulated European colonization and trade in Africa during the New Imperialism period and coincided with Germany's sudden emergence as an imperial power.

In your question where Ben uses a compass and straight edge to construct angle DEF equals to angle ABC as shown in the diagram. In my calculation the possible answer to the following questions is angle DEF is equals to angle ABC when JK is constructed equals to HI.