Tolong di jawab y yang ditabel semua nya di jawab,pakai cara​

Jawaban:

a.

r = 10,5 cm

d = 21 cm

L = π × r²

L = 22/7 × 10,5²

L = 346,5 cm²

b.

r = 28 cm

d = 56 cm

L = π × r²

L = 22/7 × 28²

L = 2.464 cm²

c.

L = 3.850

L = π × r²

3.850 = 22/7 × r²

r² = 3.850 × 7/22

r² = 1.225

r = ²√1.225

r = 35 cm

d = 70 cm

d.

r = 42 cm

d = 84 cm

L = π × r²

L = 22/7 × 42²

L = 5.544 cm²

e.

d = 126 cm

r = 63 cm

L = π × r²

L = 22/7 × 63²

L = 12.474 cm²