tolong Help me please (Math) Susah sama gk tau cara ya :v

diket:
r=7
sudud pusat: 45°

k=π2r
=22/7(2)(7)
=44

panjang busur
=45/360(k.lingkaran)
=1/8(44)
=22/4
=5,5

luas=πr²
=22/7(7)(7)
=22(7)
=154

luas juring
=45/360(L.ling.)
=1/8(154)
=19,25