tolong itu 14 apanya paki xara ya

Luas Lingkaran = phi x r x r
                                      = 3,14 x 10 cm x 10 cm x 1/4
                                      = 78,5 cm2
Keterangan =

Phi = 3,14 atau 22/7
r = jari-jari

L=1/4 x 3,14 x 10 x 10
=1/4 x 3,14 x 100
=1/4 x 314
=78,5
semoga benar