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Sagot :
The surface area is 372
.................
STEP1: Find the square of the two bottoms. notice that 1 bottom is made from 6 triangle
Square of each triangle is (1/2)x3.5x4=7
Square of each bottom: 7x6=42
Square of the two bottom: 42x2=84
STEP2: Find the square of the rectangles
Each rectangle: 4x12=48
The six recrangles: 6x48= 288
STEP 3: the total square surface is 288+84= 372
.................
STEP1: Find the square of the two bottoms. notice that 1 bottom is made from 6 triangle
Square of each triangle is (1/2)x3.5x4=7
Square of each bottom: 7x6=42
Square of the two bottom: 42x2=84
STEP2: Find the square of the rectangles
Each rectangle: 4x12=48
The six recrangles: 6x48= 288
STEP 3: the total square surface is 288+84= 372
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