Jawaban:

1. luas : (14 x 14) - (22/7 x 7²) =

196 - 154 = 42cm²

keliling : (2.14 + 2.14) - ( 22/7 x 14) =

56 - 44 = 12cm

2. luas : ½ x 3.14 x 10² = 1/2 x 314 = 157cm²

keliling : ½. 3.14 x 20 + (4.10) =

31,4 + 40 = 71,4cm

3. luas (p x l) + 1/4 x π x r²

keliling : 3 x sisi persegi + 1/4.π.d + panjang sisi

atas ¼ lingkaran

4. 1/2 x π x d = 110cm

1/2 x 22/7 x d = 110cm

11/7 d = 110cm

d = 110 : 11/7 = 110 x 7/22 = 35cm

luas : 22/7 x 35² = 3.850cm²

5. (½. 22/7. 21²) + (2.½.21.18) =

154 + 378 = 532cm²