tolong jawab ya makasih

Bab Bangun Datar
Matematika SMP Kelas VII

persegi
misal, panjang sisinya s

alas = 15 cm
tinggi = 8 cm
sisi miring = 17 cm

a + s = 15
a = 15 - s

b + s = 8
b = 8 - s

perbandingan
a/s = s/b
a x b = s²
(15 - s) x (8 - s) = s²
120 - 23s + s² = s²
23s = 120
s = 120/23
s = 5 5/23 cm
s = 5,217 cm