tolong kerjakan no 4 ya... thnx

Kelas 7 Matematika
Bab Bangun Datar

p = 1 1/2 . l
p = 3/2 . l

Keliling = 35
2 . (p + l) = 35
2 . (3l/2 + 2l/2) = 35
2 . 5l/2 = 35
l = 35/5
l = 7 cm

p = 3/2 . l
p = 3/2 . 7
p = 10,5 cm

Luas = p . l
Luas = 10,5 . 7
Luas = 73,5 cm²