tolong jawab memakai cara

a. d=14 cm>r=1/2d=1/2.14=7
L= phi x r²=22/7 x 7 x 7=154 cm²
b. d=28 cm> r=14 cm
L= phi x r²=22/7 x 14 x 14=616 cm²
c. d=8 cm> r=4 cm
L= phi x r²=3,14 x 4 x 4= 50,2 cm²
d. d=10 cm> r=5 cm
L= phi x r²=3,14 x 5 x 5=78,5 cm²
Semoga membantu:)

A.L=phi×r×r
=22/7×7cm×7cm
=154cm2

B.=22/7×14cm×14cm
=616cm2

C.=3,14×4cm×4cm
=50,24cm2

D.=3,14×10cm×10cm
=314cm2


Maaf kalo salah