mohon bantuannya dengan cara terimakasih

PR = √(4√2² + 6² -2*4√2*6*1/2)
PR = √68-24√2
PR = 5,83

L = 1/2*4√2*6*1/2√3 = 6√6
R = pqr/4L = 4√2*5.83*6/(4*6√6)
R = 3.36 cm