{"version":"1.0","type":"rich","provider_name":"Calcton","provider_url":"https://www.calcton.com","title":"弦长计算器 - 半径圆心角求弦","author_name":"Calcton","author_url":"https://www.calcton.com","width":600,"height":560,"html":"<iframe src=\"https://www.calcton.com/embed/chord\" width=\"600\" height=\"560\" style=\"border:none;max-width:100%;\" loading=\"lazy\" allow=\"clipboard-write\" title=\"弦长计算器 - 半径圆心角求弦 - Calcton\"></iframe>","cache_age":86400}