Jawab ya please dikumpulkan besok

Jawab ya please dikumpulkan besok

$luas : = frac{t}{2} times (ab + cd)$
$t = frac{2 times luas}{ab + cd}$
$t = frac{2 times 138}{16 + 7} = 12$
tinggi = AD
$cb = sqrt{ {t}^{2} + {(ab - cd)}^{2} }$

$cb = sqrt{ {12}^{2} + {(16 - 7)}^{2} }$
$cb = sqrt{144 + 81} = sqrt{225} = 15$
cb = bc
keliling = semua sisi = AB + BC + CD + AD
= 16 + 15 + 7 + 12 = 50 (C)