# Glass door

What is the weight of glass door panel 5 mm thick height 2.1 meters and a width of 65 cm and 1 cubic dm of glass weighs 2.5 kg?

Result

m =  17.063 kg

#### Solution:

$h=5/100=\dfrac{ 1 }{ 20 }=0.05 \ \\ a=2.1 \cdot \ 10=21 \ \\ b=65/10=\dfrac{ 13 }{ 2 }=6.5 \ \\ r=2.5 \ \\ V=a \cdot \ b \cdot \ h=21 \cdot \ 6.5 \cdot \ 0.05=\dfrac{ 273 }{ 40 }=6.825 \ \\ m=V \cdot \ r=6.825 \cdot \ 2.5=\dfrac{ 273 }{ 16 }=17.0625=17.063 \ \text{kg}$

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