Question

Tolong ya jawab nomor 15 sampai 18 yang benar

Answer 1

15) L juring AOB = 90/360 . 3,14.10.10
= 1/4. 314 = 78,5 cm²

L sgitiga AOB = 1/2.10.10 = 50 cm²

jadi, L yg diarsir = 78,5 - 50 = 28,5 cm²(C)


16) sudut AOB/sudut COD = L juring OAB/L juring OCD
100/175 = 40/n
100.n = 40.175
100n = 7000
n = 7000/100
n = 70 cm² (A)


17) AB = akar dr 13² - 5 ²
= akar dr 169 - 25
= √144
= 12 cm (D)


18) d² = p² - ( r1+r2)²
= 10² - (4+2)²
= 100 - 36
= 64
d = √64 = 8 cm (B)