Jawaban:
L Δ BDC = ½ DC . BD
ΔABC sebangun dengan ΔABD
AB² = AD x AC
20² = 16 x AC
AC = 400/16
= 25 cm
DC = AC - AD
= 25 - 16
= 9 cm
lihat Δ ADB siku-siku di D maka:
BD = √AB² - AD²
BD = √20² - 16²
BD = √400 - 256
= √144
= 12 cm
= ½ 9. 12
= 54 cm
jawabannya adalah: ( A )
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Jawaban:
penyelesaian:
L Δ BDC = ½ DC . BD
menentukan panjang DC
ΔABC sebangun dengan ΔABD
AB² = AD x AC
20² = 16 x AC
AC = 400/16
= 25 cm
DC = AC - AD
= 25 - 16
= 9 cm
menentukan panjang BD
lihat Δ ADB siku-siku di D maka:
BD = √AB² - AD²
BD = √20² - 16²
BD = √400 - 256
= √144
= 12 cm
L Δ BDC = ½ DC . BD
= ½ 9. 12
= 54 cm
jawabannya adalah: ( A )