A box 4

A box open at the top has a rectangular base of 200mmx300mm and an altitude of 150mm. If the base and the sides are 10mm thick, find the total surface area of the box.

Correct answer:

A =  3988 cm2

Step-by-step explanation:

a=200 mm cm=200:10  cm=20 cm b=300 mm cm=300:10  cm=30 cm c=150 mm cm=150:10  cm=15 cm t=10 mm cm=10:10  cm=1 cm  S1=a b+2 (a+b) c=20 30+2 (20+30) 15=2100 cm2  x=a2 t=202 1=18 cm y=b2 t=302 1=28 cm z=ct=151=14 cm  S2=x y+2 (x+y) z=18 28+2 (18+28) 14=1792 cm2  S3=a bx y=20 3018 28=96 cm2  A=S1+S2+S3=2100+1792+96=3988 cm2

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Showing 1 comment:
Math student
Calculate the volume and total surface area in centimeters of a triangular prism if it has a rectangular base with a=4cm and hypotenuse c=50mm and height of the prism is 0.12dm.

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