tolong dijawab dengan benar okeeyy thanks

keliling = ( 2 × CD ) + ( 2 × AD )
54 = ( 2 × 17 ) + 2AD
54 = 34 + 2AD
2AD = 54 - 34
2AD = 20
AD = 10 cm

OD = √AD² - AO²
= √10² - 6²
= √100 - 36
= √64
= 8 cm

OC = √DC² - OD²
= √17² - 8²
= √289 - 64
= √225
= 15 cm

luas = 1/2 × AC × BD
= 1/2 × ( 6 + 15 ) × ( 2 × 8 )
= 1/2 × 21 × 16
= 168 cm²