MathDB
Easy Geometry

Source: 1984 National High School Mathematics League, Exam One, Problem 9

February 22, 2020
geometry

Problem Statement

A(−1,0),B(1,0)A(-1,0),B(1,0). D(x,0)D(x,0) is a point on ABAB. CD⊥ABCD\perp AB, and CC is a point on unit circle. When x∈x\in________, segments AD,BD,CDAD,BD,CD can be three sides of a acute triangle.
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