Question

Tolong bantu kerjain pertanyaan saya

Answer 1

A. K1/2 lingkaran = 1/2 π x d
= 1/2 x 22/7 x 21
= 33

b. Kpersegipanjang + 1/2 lingkaran = 2(p+l) = 1/2 π x d
= 2 (12+7) + 1/2 x 22/7 x 7
= (2 x 19) + 11
= 38 + 11 = 49

Answer 2

Jawaban soal A
kliling = d + π x r
          = 21 + ( 22/7 x 21)
          = 21+66
          = 87 cm

jawaban soal B 
kliling = 2(l ) + p + ( 1/2 x π x d)
          = 2(12) + 7 + (1/2 x 22/7 x 7)
          = 24 + 7 + 11
          = 42 cm

jawaban soal C
kliling = 14 + 2(22+7) + (3/4 x 2 x π x r)
          = 14 + 58 + ( 3/2 x 22/7 x 7)
          = 72 + 33
          = 105 cm