Two students are using the distance formula to determine the distance between (9,4) and (-3,8) on the coordinate grid.

Step-by-step explanation:

R = 6373.0

lat1 = 52.2296756

lon1 = 21.0122287

lat2 = 52.406374

lon2 = 16.9251681

dlon = lon2 - lon1

dlat = lat2 - lat1

a = (sin(dlat/2))**2 + cos(lat1) * cos(lat2) * (sin(dlon/2))**2

c = 2 * atan2(sqrt(a), sqrt(1-a))

distance = R * c

print "Result", distance

print "Should be", 278.546

a negative exponent is translated as follows:

so, we have