pake cara dong tolong nomor 9

Cari panjang Bc terlebih dahulu
Bc² = Ac² - Ad²
= 25² - 7²
= 625 - 49
= 576
Bc = √576
= 24cm

L bangun = L ACD - L ABD
= ½ . a . t - ½ . a . t
= ½ . 24 . 7 - ½ . 6 . 7
= 84 - 21
= 63cm² (b)