Plis bantu jawab nanti ku folow deh ​

Jawaban:

1.r=14 cm

d=28 cm

L=πr^2

=(22/7) x 14^2

=616 cm^2

2.r=d/2=40/2=20 cm

d=40 cm

L=πr^2

=3,14 x 20^2

=1.256 cm^2

3.r=d/2=63/2=31,5cm

d=63 cm

L=πr^2

=3,14 x 31,5^2

=3.115,7 cm^2

4.L=πr^2

706,5 cm^2=3,14 r^2

r^2=706,5 cm^2/3,14

r^2=225

r=√225=15 cm

d=15 x 2=30 cm

maaf kalo salah

jika benar berikan yang terbaik 🙂