返回题库

PUMaC 2009 · 几何（B 组） · 第 1 题

PUMaC 2009 — Geometry (Division B) — Problem 1

专题
Discrete Math / 离散数学
难度
L3
来源
PUMaC

题目详情

  1. Find 100 times the area of a regular dodecagon inscribed in a unit circle. Round your answer to the nearest integer if necessary.
解析
  1. Find 100 times the area of a regular dodecagon inscribed in a unit circle. Round your answer to the nearest integer if necessary. Solution. 300. The area is: 1 2 ◦ 12 × × 1 × sin 30 = 3 2 .