(a)

What is the area and uncertainty in area of one side of a
rectangular wooden board that has a length
of (21.2 ± 0.3) cm and a width
of (9.8 ± 0.1) cm? (Give your answers
in cm^{2}.)

(b)

**What If?** If the thickness of the board is
(1.2 ± 0.1) cm, what is the volume of the board and the
uncertainty in this volume? (Give your answers
in cm^{3}.)

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a) Area of rectangular scirtace{:[A=lb],[(Delta A)/(A)=(Delta l)/(l)+(Delta b)/(b)=(0.3)/(21.2)+(0.1)/(9.8)=0.0243],[Delta A=5.05;" Area "=A+-Delta A],[=(207.8+-5.0)cm^(2)]:}b){:[V=A xx h=>(Delta V)/(V)=(Delta A)/(A)+(Delta h)/(h)],[(Delt ... See the full answer