yg tau tlng jwb ya,pakai caranya

Bab Bangun Datar
Matematika SMP Kelas VII

jajar genjang
keliling = 2 x (AB + BC) = 40
7 + BC = 40/2
BC = 20 - 7
BC = AD = 13 cm

a] SR = CD = 7 cm
QR = BC = 13 cm

b] ∠RQP = ∠CBA = ∠ADC = 80°
∠SRQ = 180° - ∠RQP
∠SRQ = 180° - 80°
∠SRQ = 100°

saya mencoba membuat ini