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Keliling 1/4 lingkaran
= 1/4 x π x d
= 1/4 x 22/7 x 28
= 22
Keliling 3/4 lingkaran
= 3/4 x π x d
= 3/4 x 22/7 x 14
= 33
Keliling total
= 14 + 33 + 22
= 69
19.
Keliling lingkaran
= πd
= 3,14 x 20
= 62,8
Keliling seluruhnya
= 30 x 2 + 62,8
= 60 + 62,8
= 122,8
Semoga Membantu^^
= π.d + (30+30)
= (3,14).20 + (60)
= 62,8 + 60
= 122,8 cm...................opsi A
19. keliling total = (1/4)lingkaran (r=14) + (3/4)lingkaran (r= 7) + (14)
= (1/4)(22/7).28 + (3/4)(22/7).14 + (14)
= 22 + 33 + 14
= 69 cm.....................opsi C