Step-by-step explanation:

its 1/4 of the circle
circle circumference:

we need 1/4 of it, so its

I put A, D, and E but Im not sure if they are correct
The probability that 4 are chem majors would be 5%
Slope of AD = (2k - 0)/(2j -b - 0) = 2k/(2j - b)
slope of BC = (2k - 0)/(2j - b) = 2k / (2j - b)
AD ║ BC (same slope)
Slope of AB = 0
Slope of DC = 0
AB║DC