siapa yang bisa jawab nomor 1,dan 2

No. 1)
a. L = π.r²
= 22/7 × 21 × 21
= 1382 cm²

b. L = π.r²
= 3,14 × 25 × 25
= 1962,5 cm²

c. L = π.r²
= 22/7 × 49 × 49
= 7546 cm²

d. L = π.r²
= 22/7 × 70 × 70
= 15400 cm²

e. L = π.r²
= 22/7 × 3,5 × 3,5
= 38,5 cm²


No. 2)
a. L = 1/4 π d²
= 1/4 × 3,14 × 50²
= 1/4 × 3,14 × 2500
= 1962,5 cm²

b. L = 1/4 π d²
= 1/4 × 22/7 × 1,4²
= 1/4 × 22/7 × 1,96
= 1,54 cm²

c. L = 1/4 π d²
= 1/4 × 22/7 × 35²
= 1/4 × 22/7 × 1225
= 962,5 cm²

d. L = 1/4 π d²
= 1/4 × 3,14 × 25²
= 1/4 × 3,14 × 625
= 490,625 cm²

e. L = 1/4 π d²
= 1/4 × 3,14 × 18²
= 1/4 × 3,14 × 324
= 254,34 cm²