tolong di bantu besok gari senin dikumpulin
Jawaban:
Rumus Kekongruenan Segitiga:
AC² = CD × BC
AB² = BD × BC
AD² = BD × DC
Rumus Pythagoras Segitiga:
AC² + AB² = BC²
BD² + AB² = AD²
Diketahui:
AB = 9 cm
AC = 12 cm
Ditanya:
a. BC?
b. BD?
c. AD
Jawab:
a.
AC² + AB² = BC²
12² + 9² = BC²
144 + 81 = BC²
225 = BC²
√225 = BC
15 cm = BC
b.
AB² = BD × BC
9² = BD × 15
81 = BD × 15
81/15 = BD
5 6/15 = BD
5 2/5 = BD
5.4 cm = BD
c.
BD² + AB² = AD²
5.4² + 9² = AD²
29.16 + 81 = AD²
110.16 = AD²
√110.16 = AD
10.49 cm = AD
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