A.keliling=¼ x 2 x π x r + r +r

¼ x 2 x 22/7 x 21 +21+21

¼ x 11 x 3 +21+21

33 : 4 +21 +21= 50,25

Luas=¼ x π x r²

¼ x 22/7 x 21 x 21

¼ x 22 x 3 x 21

¼ x 1,386

4 : 1,386

346,5

B.keliling= ½ x 2 x π x r + r + r

½ x 2 x 22/7 x 14 +14 + 14

½ x 11 x 2 + 28

½ x 22 + 28

½ x 50 = 50:2=25

Luas= ½ x π x r²

½ x 22/7 x 14 x 14

11 x 2 x 14

308

C. keliling = ½ x π x d + d

½ x 22/7x 14 + 14

½ x 22 x 2 + 14

58 : 2= 29

Luas= ½ x ¼ x π x d²

½ x ¼ x 22/7 x 14 x 14

¼ x 11 x 2 x 14

308 : 4 = 77

D. keliling = 3/4 x 2 x π x r + r + r

3/4 × 2 × 22/7 × 7 + 7+7

33+ 14

47

luas = 3/4 × π × r ²

3/4 × 22/7 × 7 ×7

231 ÷ 2

115,5

semogamembantu :-)

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