What will be the total painted surface area of the block?

440 cm2

380 cm2

324 cm2

404 cm2

Question

What will be the total painted surface area of the block?

440 cm2

380 cm2

324 cm2

404 cm2

anonymous · Answer

attachment

cwrw238 · Answer

the cross section is a trapezium

total area = 2*area trapezia + area of the 4 rectangles

do you know how to get area of a rectangle?

cwrw238 · Answer

like the base of this block?

anonymous · Answer

area of a rectangle is = A = L*W

cwrw238 · Answer

yes so area base = 10*12 = 120 cm2 right ?

anonymous · Answer

yepp

cwrw238 · Answer

ok so you can now find area of the back, top and slanting faces of the block given the supplied width and lengths.

area of each trapezium  is  1/2 (7 + 10) / 4
7 and 10 are the 2 parallel sides and 4 is the height

cwrw238 · Answer

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cwrw238 · Answer

so do you want to figure the area out?

anonymous · Answer

yes

cwrw238 · Answer

great

cwrw238 · Answer

you have to calculate area of 4 rectangles and 2 trapezia (same area)
and add them up