Tolong nomor 10 ya. Terima kasih banyak

r* = 4t^2i+3t^2j
=8t i +6t j
= 8(1)i +6(1)j
= 8i +6 j
r^2 = 8^2 + 6^2
r^2 = 16 +12
r^2 = 28
r =akar 28
r= 2akar 5