HMMT 二月 1998 · 几何 · 第 1 题
HMMT February 1998 — Geometry — Problem 1
题目详情
英文原题
Question One . [3 points]
Quadrilateral ALEX , pictured below (but not necessarily to scale!)
can be inscribed in a circle; with m ∠ L A X = 20 ° and m ∠ A X E = 100 ° :
AENL
Calculate m ∠ E D X .DX
解析
英文解析
- m EDX = 180 − m LAX − m ELA = 180 − m LAX − (180 − m AXE ) = 80 .