Tolong jawab dengan benar​

Jawab:

1. 2 x π x r

= 2 x 22/7 x 21

= 2 x 22 x 3

= 44 x 3

= 132 cm

2. 1/2 x π x d

= 1/2 x 3,14 x 20

= 10 x 3,14

= 31,4 cm

3. π x r x r

= 3,14 x 1,5 x 1,5

= 3,14 x 2,25

= 7,065 cm2

4. π x r x r

= 3,14 x 17,5 x 17,5

= 3,14 x 306,25

= 961,625 cm2

5. π x r x r

= 3,14 x 15 x15

= 3,14 x 225

= 706,5 cm2

^^ Selamat Belajar-

Jawaban:

1. keliling = phi x 2 x r = 22/7 × 2 × 21 = 132 cm

2. keliing = 1/2 x phi x d = 1/2 x 3.14 x 20 = 31,4 cm

keliling taman = 20 + 31,4 = 51,4 cm

3. luas = phi x r x r = 3,14 × 1,5 ×1,5 = 7,064 m^2

4. luas = 1/2 x phi x r x r = 1/2 x 22/7 × 1,75 x 1,75 = 4,8125 cm^2

5. luas = phi x r x r = 3,14 x 15 x 15 = 706,5 cm ^2

keliling = phi x d = 3,14 × 30 = 94,2 cm