A. 312 cm²
B. 276 cm²
C. 268 cm²
D. 252 cm²
Diketahui AB = 16 cm, AF = 13 cm, BD = 10 cm. Luas bangun tersebut adalah ….
Jawaban Terkonfirmasi
AB = 16 cm
AF = 13 cm
BD = 10 cm
CE = 2 × V[AF^2 – (1/2 × BD)^2]
CE = 2 × V[13^2 – (1/2 × 10)^2]
CE = 2 × V[13^2 – 5^2]
CE = 2 × V[169 – 25]
CE = 2 × V144
CE = 2 × 12
CE = 24 cm
t (jajargenjang) = 1/2 × CE
t (jajargenjang) = 1/2 × 24
t (jajargenjang) = 12 cm
L bangun = L jajargenjang + Lbelah ketupat
L bangun = (AB × t) + (1/2 × BD × CE)
L bangun = (16 × 12) + (1/2 × 10 × 24)
L bangun = 192 + 120
L bangun = 312 cm^2 (A)