a
$A =2 \times( L \times B + B \times T + T \times L )$
$\therefore A =2 \times(4.234 \times 1.005+1.005 \times 0.0201+0.0201 \times 4.234)$
$\therefore A =2 \times(4.2552+0.0202+0.0851)$
$\therefore A =8.721 m ^{2}$
$\therefore A =8.721 m ^{2}$ to correct significant digits
$V = L \times B \times T$
$\therefore V =4.234 \times 1.005 \times 0.0201$
$\therefore V =0.0855 m ^{3}$ to correct significant digits