jawab ya:)) #maapyaaaaaa

Nomor 1]

a] Panjang jari jari

r = K/2π
r = 66 /2 x 22/7
r = 66 x 7/44
r = 10,5 cm

b] Luas Lingkaran

L = π x r²
L = 22/7 x 10,5²
L = 22/7 x 110,25
L = 346,5 cm²


Nomor 2]

AOB = COD = 70°

a] Sudut AOD

AOD = (360 - (2AOB)) /2
AOD = (360 - 140)/2
AOD = 220/2
AOD = 110°

b] ACD kurang jelas letak sudutnya


Nomor 3]

a] Luas Lahan

= (120/360) x Luas lingkaran
= 1/3 x 22/7 x 42² cm
= 22/21 x 1764
= 1848 cm²

b] Panjang kawat

= (120/360) x keliling lingkaran
= (1/3) x 2 x 22/7 x 42
= (1/3) x 44 x 6
= 88 cm

4] Garis Singgung

r = √[P² - L²] - R
r = √[75² - 72²] - 9
r = √[5625 - 5184] - 9
r = √441 - 9
r = 21 - 9
r = 12 cm