tolong nomor 4 beserta cara.. makasih

Luas kurva dan garis

y = 1/2
y = 1- x²
kurangkan
0 = - 1/2  + x²
x² - 1/2 = 0
a = 1 , b = 0 , c = -1/2
D= b² - 4ac
D = (0)² - 4(1)(-1/2)
D = 2
L = D√D/ (6 a²)
L = (2√2)/ (6)(1)²
L = (2√2)/(6)
L = ¹/₃ √2 satuan