MathDB

9

Part of 1984 National High School Mathematics League

Problems(1)

Easy Geometry

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

2/22/2020
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.
geometry