PUMaC 2007 · 几何（B 组） · 第 2 题

PUMaC 2007 — Geometry (Division B) — Problem 2

A black witch’s hat is in the classic shape of a cone on top of a circular brim. The cone has a slant height of 18 inches and a base radius of 3 inches. The brim has a radius of 5 inches. What is the total surface area of the hat?

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