当y = - 2时
- x² = - 2
x = ± √2
x = √2
则
= ∫(0→√2) (- x²) dx
= - x³/3 |(0→√2)
= - 2^(3/2)/3 + 0
= - (2√2)/3
面积 = |∫(0→√2) (- x²) dx| = (2√2)/3
当y = - 2时
- x² = - 2
x = ± √2
x = √2
则
= ∫(0→√2) (- x²) dx
= - x³/3 |(0→√2)
= - 2^(3/2)/3 + 0
= - (2√2)/3
面积 = |∫(0→√2) (- x²) dx| = (2√2)/3