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- Math problems and solving methods in the fourth grade of primary school.
Math problems and solving methods in the fourth grade of primary school.
Analysis: After folding a rectangular piece of paper in half, we can see that ∠2=∠3, while ∠ 1+∠ 2+∠ 3 = 180 (as shown below).
(1) If ∠ 1 = 50, ∠ 2 = (180-50) ÷ 2 = 65.
(2) If ∠ 2 = 50, ∠ 1 = 180-50× 2 = 80.
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