tolong jwb pake cara

15.)
sm² = 9²+12²
sm² = 81 + 144
sm = √225
sm = 15 cm
16.)
k = 2 . π . r
= 2 . 22/7 . 14
= 2 . 22 . 2
= 88 cm
l = π . r²
=22/7 . 14 . 14
=22.2.14
=616 cm²