Image caption, ...you've done it! The sectors rearranged into the rectangle show the area of the curved surface of the cone = π × radius × slant length.

Image caption, ...you've done it! The sectors rearranged into the rectangle show the area of the curved surface of the cone = π × radius × slant length.

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微软 Surface Pro 11 是该公司二合一笔记本电脑中最好的一款，因为它配备了快速高效的 Snapdragon X Elite 芯片、新的 OLED 屏幕选项和令人难以置信的电池 ...