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How to do the fifth question on page 95 of the first volume of the fifth grade math book in primary school?
(2+ 10)* 12/2=72 (square centimeter) is the area of the whole trapezoid.

3 * 4/2 = 6 (square centimeter) is the area of a small triangle.

(4+6) * 4/2 = 20 (square centimeter) is the area of the small trapezoid at the bottom.

72-6-20 = 46 (square centimeter)

Its area is 46 square centimeters.