tolong bantu no 13 makasih

L layang-layang = 1/2 . d1 . d2
168 = 1/2 . 16 . d2
168 = 8 . d2
d2 = 21

perbandingan sumbu simetri = 2 : 5
a : b = 2 : 5
a = 2/7 . 21
a = 6

b = 5/7 . 21
b = 15

sisi miring 1 =[tex] \sqrt{8 ^{2}+6 ^{2} } [/tex]
= [tex] \sqrt{100} [/tex]
= 10

sisi miring 2 = [tex] \sqrt{15 ^{2}+8 ^{2} } [/tex]
= [tex] \sqrt{289} [/tex]
= 17

keliling = 2 (17+10)
= 2 (27)
= 54