tolong bantu jawab pakai cara

de= be = 20 cm

od^2 = cd^2 - oc^2
= 15^2 - 9^2
= 225 - 81
= 144
od = 12 cm

oe^2 = de^2 - od^2
= 20^2 - 12^2
= 400 - 144
= 256
oe = 16 cm

bd = 2od = 2. 12 = 24 cm
ec = oc + oe = 9 + 16 = 25

L. layang layang BCDE = bd×ec ÷2 = 24 × 25 ÷ 2 = 300 cm^2
L. jajargenjang ABEF = ab × be= 25 × 20 = 500 cm^2

L. ABCDEF = 300 + 500 = 800 cm^2 (B)