Please answer this question
I WILL MARK AS BRAINLIEST
please explain step by step in English
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1) 28x2=56
35x2=70
70+56=126
8X2=16
20x2=40
40+16=56
20+10=30
30+20=50
50+8=58
58+18=76
56+70+126+16+40+56+30+50+58+76=513 cm
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