Kunci Jawaban Matematika Kelas 8 SMP Uji Kompetensi Semester 2 Halaman 319 320 321

AD = √(64 + 36)

AD = √100

AD = 10 m

Luas ABC = Luas ABD + Luas ADC

= Luas ABD + (3/2 x Luas ABD)

= (1/2 x AB x BD) + (1/2 x 3/2 x AB x BD)

= (1/2 x 8 x 6) + (1/2 x 3/2 x 8 x 6)

= 24 + 36

= 60 m²

Luas ABC = 1/2 x AB x BC

60 = 1/2 x 8 x BC

BC = 60 x 2 / 8

BC = 120 / 8

BC = 15 m

DC = BC - BD