Penjelasan dengan langkah-langkah:
Geometri analitik
BD = CD, AF = FB dan AE = EF
∆ABC = 128
∆ABD = ½128 = 64
∠ ADC = 95°
∠ ADB = 85°
dalam soal tertera
AF : FB
AE : EF : FB
1 : 1 : 2
maka L.arsir
= (AE+FB)/(AB) × L.ABD
= 3/4 × 64
= 48 cm² ( B ) ✓
Jawaban:
B. 48 cm²
Luas ∆ABD:
= ½ABC
= ½ × 128
= 64 cm²
luas daerah arsir:
= ∆BFD + ∆AED
= ½ × ∆ADB + ¼ × ∆ADB
= ½ × 64 + ¼ × 64
= 32 + 16
= 48 cm² (B)
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Verified answer
Penjelasan dengan langkah-langkah:
Geometri analitik
BD = CD, AF = FB dan AE = EF
∆ABC = 128
∆ABD = ½128 = 64
∠ ADC = 95°
∠ ADB = 85°
dalam soal tertera
AF : FB
AE : EF : FB
1 : 1 : 2
maka L.arsir
= (AE+FB)/(AB) × L.ABD
= 3/4 × 64
= 48 cm² ( B ) ✓
Jawaban:
B. 48 cm²
Penjelasan dengan langkah-langkah:
Luas ∆ABD:
= ½ABC
= ½ × 128
= 64 cm²
luas daerah arsir:
= ∆BFD + ∆AED
= ½ × ∆ADB + ¼ × ∆ADB
= ½ × 64 + ¼ × 64
= 32 + 16
= 48 cm² (B)