Question

OMG!! I’m stuck on 4a) b) c) Help please

Answer 1

Answer:

a) 750 cm

b) 288 cm

c) 2112 cm

Step-by-step explanation:

Formula for getting the surface area of a rectangular prism:

SA = 2 (WL + HL + HW)

a) SA = 2 (WL + HL + HW)

= 2(75) + 2(225) + 2(75)

= 150 + 450 + 150

= 750 cm^2

b) SA = 2 (WL + HL + HW)

= 2(48) + 2(72) + 2(24)

= 96 + 144 + 48

=288 cm^2

c) SA = 2 (WL + HL + HW)

= 2(400) + 2(400) + 2(256)

= 800 + 800 + 512

= 2112 cm^2

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Answer 2

Answer:

Below in bold.

Step-by-step explanation:

(a) The surface area  consists of the sum of the area of 3 sets of 2 congruent rectangles. The 2 rectangles are on opposite sides of the solid.

= 2(15*15) + 2(5*15) + 2(5&15)

= 450 + 150 + 150

= 750 unit^2.

(b). Similarly to the above:

Surface area = 2(12*6) + 2(4*12) + 2(4*6)

= 144 + 96 + 48

= 288 unit^2.

(c)  Again:

Surface area =  2(25*16) + 2(25*16) + 2(16*16)

= 400 + 400 + 256

= 1056 unit^2.