Πεψενθε 

`and`(S = `*`(`/`(15, 2), 20), `*`(`/`(15, 2), 20) = 150) 

`and`(a = sqrt(`*`(`+`(`^`(15, 2), `^`(20, 2)), `/`(1, 4))), `and`(sqrt(`*`(`+`(`^`(15, 2), `^`(20, 2)), `/`(1, 4))) = `+`(`*`(`/`(5, 2), `*`(sqrt(`+`(`^`(3, 2), `^`(4, 2)))))), `+`(`*`(`/`(5, 2), `*`... 

`and`(p = `+`(`*`(`/`(25, 2), `*`(`*`(`/`(1, 2), 4)))), `+`(`*`(`/`(25, 2), `*`(`*`(`/`(1, 2), 4)))) = 25) 

150 = `+`(`*`(25, `*`(r))) 

r = 6 

`and`(d = sqrt(`+`(`*`(`^`(R, 2)), `-`(`*`(`^`(h, 2))))), `and`(sqrt(`+`(`*`(`^`(R, 2)), `-`(`*`(`^`(h, 2))))) = sqrt(`+`(`^`(10, 2), `-`(`^`(6, 2)))), sqrt(`+`(`^`(10, 2), `-`(`^`(6, 2)))) = 8))