faridarafarid
1. a. keliling persegi panjang = 2(p+l) = 2(28+14) = 84 keliling lingkaran = 2πr = 2 x 22/7 x 7 = 44 keliling bangun yang diarsir = 84 - 44 = 40 b. keliling 1/4 lingkaran = 1/4 x 2πr = 1/4 x 2 x 3,14 x 10 = 1/2 x 31,4 = 15,7 c. keliling persegi = 4 x s = 4 x 21 = 84 keliling 1/2 lingkaran = 1/2 x πd = 1/2 x 22/7 x 21 = 1/2 x 22 x 3 = 11 x 3 = 33 keliling bangun tersebut = 84 + 33 =117
= 2(28+14)
= 84
keliling lingkaran = 2πr
= 2 x 22/7 x 7 = 44
keliling bangun yang diarsir = 84 - 44 = 40
b. keliling 1/4 lingkaran = 1/4 x 2πr
= 1/4 x 2 x 3,14 x 10
= 1/2 x 31,4 = 15,7
c. keliling persegi = 4 x s
= 4 x 21 = 84
keliling 1/2 lingkaran = 1/2 x πd
= 1/2 x 22/7 x 21
= 1/2 x 22 x 3
= 11 x 3 = 33
keliling bangun tersebut = 84 + 33 =117