數學問題呀!!{急了}

第一題:

1.76÷3.14÷2

=1.76/3.14÷2

=44/157



第二題:


10.14x3.14

=31.8396



好好珍惜

做左好耐

　它的半俓是：
　１．７６／３．１４／２＊１００
＝２８．０３（cm）（取二位小數）


　它的圓周是：
　１０．４＊３．１４
＝３２．６５６（米）

圆周＝π x 直径
或
圆周＝2 π x 半径
(记住2半径=直径，两条方程式都可用)


1。 1.76=2 x π x(半径)
半径=1.76/(2π)
=0.2803m
=28.03cm


2. 圆周=π x 10.4
=32.656 米

1. 2TT r = 1.76

2.2TT 5.2 =圓周



半徑=25.88..cm
(TT = 3.4)
圓周=35.36 m
===========================
唔知岩唔岩嫁..希望岩啦

1)

它的半俓 = 1.76m ÷ 22/7 ÷ 2 = 0.28 m
(22/7 = π)
(you need to ÷ 2 because you want 半俓 not 直徑)


2)

它的圓周 = 10.4 米 × 3.14 = 32.656 米

(c = d × π or 2 × r × π)

答1:
1.76×100÷3.14÷2(人地1.76係m，答案要求答cm，所以要先乘100)
=176÷3.14÷2
=28.0254...
=28.03(cm)(取小數後兩位)
答2：
10.4×3.14
=32.656(米)

1)
2 π r =1.76m
r=(1.76/2π)m
take π=22/7,
r=0.28m

2)
circumference =2 π r
=π (10.4m)
take π=3.14,
circumference =32.656m

圓周=直徑 x π

1) 1.76/π/2
=0.28cm

2) 10.4 X π
=32.7m

1. 2 π r = 1.76
then solve r

r =1.76 /2π

2. 圓周=2 π r
= 2 * 3.16*10.4/2 (p.s r = 10.4/2 )
= 自己用calculator 可以計埋~~!!