pliisss bantuinn yaa

Busur BC =

7/6,3 x 8/x
x = 6,3.8/7
= 50,5/7
= 7,2

Busur AC + BC = 1/2 K Lingkaran

Maka :

K = (7,2+6,3)2
= (13,5)2
= 27 <=


Cari luas lingkaran dahulu

L = phi.r²
= 3,14.4.4
= 50,24 cm²

Lalu gunakan perbandingan :

juring / luas = a / 360
10 / 50,24 = a / 360
a = 360.10/50,24
= 72°

Pb = a/360 . 2.phi.r
= 72/360 . 2.3,14.4
= 1/5 . 25,12
= 5 cm