Question

tolong jawab yang b sampai e dong kk plisssssssssssssssssss​

Answer 1

a. r = 21 cm

L = π . r²

= 22/7 . 21²

= 22/7 . 441

= 22 . 63 = 1386 cm²

b. r = 28 cm

L = 22/7 . 28²

= 22/7 . 748

= 22 . 112 = 2464 cm²

c. r = 35 cm

L = 22/7 . 35²

= 22/7 . 1225

= 22 . 175 = 3850 cm²

d. d = 28 cm

r = d/2 = 28/2 = 14 cm

L = 22/7 . 14²

= 22/7 . 196

= 22 . 28 = 616 cm²

e. d = 40 cm

r = 40/2 = 20 cm

L = 3,14 . 20²

= 3,14 . 400 = 1256 cm²