sudut pusat 72° dan panjang Jari-jari 28 cm. keliling juring KLM adalah.... a. 28 cm b. 35,2 cm C. 91,2 cm d. 56 cm

Keliling Juring KLM = n x Keliling total

n:
= 72/360
= 36/180
= 4/20
= 1/5

Diameter:
= 28 x 2
= 56

Keliling Juring KLM:
= 1/5 x (22/7 x 56) + 56
= 1/5 x (22 x 8) + 56
= 1/5 x 176 + 56
= 35,2 cm + 56
= 91,2 cm

Jawaban: C

Keliling lingkaran = 2 . phi. r = 2 . 22/7 . 28 = 176 cm

Panjang busur = 72/360 x 176 = 1/5 x 176 = 35,2 cm

Keliling juring = 2 x jari2 +panjang busur = 2 x 28 + 35,2 = 56 + 35,2 = 91,2 cm

Jawaban C