## Isosceles Trapezium

#### Problem

An isosceles trapezium `ABCD` is placed inside a semicircle such that they share the same base, `AD` = 4, and the lengths `AB = DC` = 1 are chords.

Find the length `BC`.

Problem ID: 79 (May 2002) Difficulty: 3 Star

An isosceles trapezium `ABCD` is placed inside a semicircle such that they share the same base, `AD` = 4, and the lengths `AB = DC` = 1 are chords.

Find the length `BC`.

Problem ID: 79 (May 2002) Difficulty: 3 Star