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How to do the ninth question on page 105 of the fifth grade math book in primary school?
1+ 1=2 (cm)

(0.6x2+2)x3÷2=4.8(cm2)

(2.3x2+2)x3÷2=9.9 (square centimeter)

(2.3x2+3x2+2)x3÷2= 18.9 (square centimeter)

2x9= 18 (square centimeter)

18+4.8+9.9+18.9 = 51.6 (square centimeter)

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