import math

n = 6
r = 2
y = 2
x = 2
a = 15
b = 30
cosine = (r * (math.cos(a) + 2 + r * (math.cos(b) * 2)))
y2 =  10
y1 = 8
x2 = 9
x1 = 8

print((3 + 4) * (5))

print((n ** 2 - (n)) / 2)

print(math.pi * 4 * r ** 2)

print(math.sqrt(cosine))

print((y2 - y1)  / (x2 - x1))
