Question

Tolong no 11,12,13,14,15

Answer 1

11)
Luas lingkaran = πr .r
= 22/7 x 7 x 7
= 154 cm2
luas 1/2 lingkaran = 77 cm2

Luas persegi = 14 x 14 = 196
Luas arsiran = 196 - 77 = 119 cm2

12)
Luas persegi = 14 x 14 = 196 cm2
Luas lingkaran = πr . r
= 22/7 x 7 x 7
= 154 cm2

Luas arsiran = 196 - 154 = 42 cm2

13)
1/4 π d^2  : 1/4 π d^2
1/4 π D^2  : 1/4 π 9D^2  ----> hilangkan 1/4 π karena dua ruas sama
D^2 : 9D^2
1 : 9

Jadi perbandingannya 1 : 9

14)
busur AB / busur BC = AOB/360  / BOC/360
40 / BC = 50/360  /  80/360
40 / BC = 5/36 x 9/2
40 / BC = 45/72
BC = 40 x 72/45
BC = 64 cm

15)
Juring AOB = sudut AOB/360 x luas lingkaran
= 135/360 x 48
= 6.480/360
= 18 cm2