Jawapan

2016-09-22T21:13:39+08:00
Jejari = x = 8
delta x = 8.002-8 = 0.002
x = 8

Luas = x²
dL/dx = 2x = 2(8) =16

delta L/delta x = dL/dx
delta L/0.002 = 16
delta L = 16 × 0.002 = 0.032 cm²
ha ahh salah sorry²
Luas= 4πr² dL/dr= 8πr
*Luas= 4πx² dL/dx= 8πx
dL/dx= 8π(8)= 16π
aduh salah pula dpt 64π