bantu jwb nomer 8 dan 9 yaaaa please....

8) K = 3,5 + 3,5 + ( 3/4 x 2πr)
7 + ( 3/4 x 2 x 22/7 x 3,5)
7 + ( 3/4 x 22)
7 + 16,5 = 23,5 cm (D)


9) Larsir = 10² - (1/2 πr²)
100 - (1/2 x 3,14 x 5 x 5)
100 - 39,25 = 60,75cm²

8)K=phi×d×3/4
=22/7×7×3/4
=16,5cm

9)L=(s×s)-(1/2×phi×r×r)
=(10×10)-(1/2×3,14×5×5)
=100-39,25
=60,75cm^2