一个圆形花坛，它的直径是16米．在花坛外1米的地方绕花坛设置了一圈护栏，护栏长多少米
\u4e00\u4e2a\u5706\u5f62\u82b1\u575b,\u76f4\u5f84\u662f16\u7c73\u3002\u5728\u5b831\u7c73\u5916\u7684\u5730\u65b9\u7ed5\u82b1\u575b\u8bbe\u7f6e\u4e86\u4e00\u5708\u62a4\u680f,\u62a4\u680f\u957f\u591a\u5c11\u7c73?\u89e3\uff1b
\u5706\u7684\u76f4\u5f84\u662f16\u7c73\uff0c
\u5728\u5b831\u7c73\u5916\u7684\u5730\u65b9\u7ed5\u82b1\u575b\u8bbe\u7f6e\u4e86\u4e00\u5708\u62a4\u680f\uff0c\u6240\u4ee5
16+1=17\u7c73
\u7136\u540e\u5957\u516c\u5f0f\uff1a17\u00d73.14=53.38\u7c73
\u7b54\uff1a\u62a4\u680f53.38\u7c73
\u7b80\u4fbf\u65b9\u6cd528.26+3.14\u00d71\u00d72
=28.26+6.28
=34.54\u7c73
=18×3.14
=56.52（米），
答：护栏长56.52米．
绛旓細锛16+1+1锛壝3.14=18脳3.14=56.52锛堢背锛夛紝绛旓細鎶ゆ爮闀56.52绫筹紟
绛旓細3.14脳16=50.24锛堢背锛 3.14脳锛16梅2锛 2 =3.14脳64 =200.96锛堝钩鏂圭背锛 绛旓細鑺卞潧鐨勫懆闀挎槸50.24绫筹紝闈㈢Н鏄200.96骞虫柟绫筹紟 鏁呯瓟妗堜负锛50.24锛200.96锛
绛旓細鎵浠ワ紝杩欎釜鑺卞潧鍗犲湴( 200.96)骞虫柟绫.鐭冲瓙璺殑鍐呰竟缂樺崐寰勶細16梅2=8锛堢背锛夊杈圭紭鐨勫崐寰勶細16梅2+2=10锛堢背锛夎繖鏉¤矾鐨勯潰绉細3.14脳锛10²-8²锛=113.04锛堝钩鏂圭背0
绛旓細(16+1+1)脳3.14=56.55(绫)
绛旓細鈶鑺卞潧鐨勯潰绉 瑕佹眰鑺卞潧鐨勯潰绉紝鎴戜滑闇瑕佹眰鍑鸿姳鍧涚殑鍗婂緞 16梅2=8绫 鎵浠ラ潰绉槸 3.14脳8脳8=200.96骞虫柟绫 鈶¤姳鍧涚殑鍛ㄩ暱 瑕佹眰缁曡姳鍧涜蛋涓鍦堢殑闀垮害灏辨槸闇瑕佺畻鍑鸿姳鍧涚殑鍛ㄩ暱 3.14脳16=50.24绫 绛旓細杩欎釜鍦嗗舰鑺卞潧鐨勯潰绉槸200.96骞虫柟绫筹紝缁曡繖涓姳鍧涜蛋涓鍦堢殑闀垮害鏄50.24绫炽
绛旓細1銆鐩村緞鏄16绫鐨鍦嗗舰鑺卞潧,鍦ㄥ畠鍛ㄥ洿淇竴鏉2绫冲鐨勭幆褰究閬,鐩稿綋浜2涓渾鍦,涓涓澶у渾(桅20),涓涓皬鍦(桅16),鐒跺悗姹傚畠浠箣闂(鍦嗙幆)鐨勯潰绉樊,鏍规嵁棰樻剰鏈:S鍦嗙幆=S澶у渾-S灏忓渾 =3.14*20/2*20/2-3.14*16/2*16/2 =3.14*10*10-3.14*8*8 =3.14(10*10-8*8) =3.14*36 =113.04骞虫柟绫=11304骞虫柟鍒嗙背2...
绛旓細3.14*16=50.24锛堢背锛50.24梅1.57=32锛堢泦锛
绛旓細201.06骞虫柟绫冲柦銆
绛旓細杩欐槸姹傚渾鐜潰绉 16梅2=8锛堢背锛8+2=10锛堢背锛3.14脳锛10²-8²锛=3.14脳锛100-64锛=3.14脳36 =113.04锛堝钩鏂圭背锛夌瓟锛氳繖鏉″皬璺殑闈㈢Н鏄113.04骞虫柟绫炽
绛旓細3.14脳锛16梅2锛2-3.14脳锛8梅2锛2=3.14脳64-3.14脳16=200.96-50.24=150.72锛堝钩鏂圭背锛夛紱绛旓細杩欎釜鑺卞潧鑳界鑺辩殑闈㈢Н鏄150.72骞虫柟绫筹紟
