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OpenStudy (anonymous):
Given: B, C, D, and E lie in plane m;
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OpenStudy (anonymous):
OpenStudy (mathstudent55):
This theorem may help: "If a line is perpendicular to each of two intersecting lines at their point of intersection, then the line is perpendicular to the plane determined by them."
OpenStudy (anonymous):
Would that only prove that the angle ACD is perpendicular to the plane? Thank you so much for your help btw
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