Kak bantuin please, makasih

sisi 1 : (2+√3) = a

sisi 2 : (√3-2) = b

dit : sisi terpanjang/diagonal = c

jwb : c²= a²+b²

c² = (2+√3)² + (√3-2)²

c² = (4+√6+√6+3) + (3-√6-√6+4)

c² = 7+2√6 + 7-2√6

c² = 14

c = √14

jawabannya C