SubArea: Applications of definite integralLevel: AProject ID: 1103068005Accepted: 1Clonable: 0Easy: 1Find the missing real constant \( a \) so that the green area and the red area indicated in the picture do equal.\( a=-2\pi \)\( a=-\frac32\pi \)\( a=-\frac{\pi}2 \)\( a=-3\pi \)
