1、3.5d1.31.63c91.064用圆规画一个直径是2.8cm的圆,并求出它的周长。5一只挂钟的分针长20cm,经过45分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是43.96cm,它的直径是多少厘米?(1)d=1.2cm(2)d=3.2cm(3)d=2cm17cm8.8cm1310.71.93135.024用圆规画一个直径是2.4cm的圆,并求出它的周长。5一只挂钟的分针长20cm,经过65分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是47.1cm,它的直径是多少厘米?(1)d=3.2cm(2)r=8cm(3)r=3cm16cm7.6cm191.60.81.7762.85一
2、只挂钟的分针长10cm,经过60分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是25.12cm,它的半径是多少厘米?(1)d=0.8cm(2)r=2.4cm(3)d=1.5cm7cm9.6cm111.81.51.7653.385一只挂钟的分针长50cm,经过75分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是21.98cm,它的半径是多少厘米?(2)d=1.6cm(3)r=4.5cm14cm10cm77.11.5421.984用圆规画一个半径是3.2cm的圆,并求出它的周长。5一只挂钟的分针长10cm,经过50分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是65.94cm,它
3、的直径是多少厘米?(1)d=1.6cm(3)d=2.5cm12cm6.4cm156.51.8925.124用圆规画一个半径是2cm的圆,并求出它的周长。5一只挂钟的分针长10cm,经过30分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是75.36cm,它的半径是多少厘米?(1)r=2.4cm(2)d=4cm(3)r=1.5cm13cm45.40.31.11100.485一只挂钟的分针长10cm,经过90分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是53.38cm,它的直径是多少厘米?(2)d=5.6cm(3)r=2cm7.4cm168.71.94116.185一只挂钟的分针长20cm,经过85分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是59.66cm,它的直径是多少厘米?(1)r=2.8cm(2)d=7.2cm(3)d=3cm2cm6.8cm34.91.7931.44用圆规画一个直径是2cm的圆,并求出它的周长。5一只挂钟的分针长50cm,经过100分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是56.52cm,它的直径是多少厘米?(1)d=2.8cm(2)r=5.6cm3cm2.2cm207.60.21.586.285一只挂钟的分针长40cm,经过5分钟后,分针尖端所走的路程是多少厘米?6一个圆的周长是21.98cm,它的直径是多少厘米?