tolong dibantu ya kanomer 21 jangan lupa pake cara

Kelas 8 Matematika
Bab Teorema Pythagoras

BC = √(BD² - CD²)
BC = √(25² - 15²)
BC = √(625 - 225)
BC = √(400)
BC = 20 cm

AC = √(AD² - CD²)
AC = √(39² - 15²)
AC = √(1.521 - 225)
AC = √(1.296)
AC = 36 cm

AB = 36 - 20
AB = 16 cm

CD = 15 cm
AD = 39 cm
AC = √AD² - CD²
AC = √39² - 15²
AC = √1.521 - 225
AC = √1.296
AC = 36 cm

BC = √BD² - CD²
BC = √25² - 15²
BC = √625 - 225
BC = √400
BC = 20 cm

Maka,
AB = AC - BC
AB = 36 cm - 20 cm
AB = 16 cm
Jawaban : C