Zibo mathematics examination questions in 2006. - Training Enrollment Network

Zibo mathematics examination questions in 2006.

△EMC is an isosceles right triangle.

Take the midpoint n of EC and connect MN.

Because m is the midpoint of DB, MN is perpendicular to EC.

Suppose ED= 1, then EA=BC=√3, AC= 1. (congruent triangles)

Available MN=( 1+√3)/2

EN=NC=( 1+√3)/2

So △EMC is an isosceles right triangle.

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