Question

No 51 ya.. dengan caranya.. Makasih

Answer 1

ABC ≡ BDE

BC = 15 cm
CE = 1/5 × BC
CE = 1/5 × 15 cm
CE = 3 cm

BE = BC - CE
BE = 15 - 3
BE = 12 cm

AB = BE = 12 cm

AC^2 = BC^2 - AB^2
AC^2 = 15^2 - 12^2
AC^2 = 225 - 144
AC = √81
AC = 9 cm

BD = AC = 9 cm

L ABDEC
= L ABC + L BDE
= 1/2 × AB × AC + 1/2 × BE × BD
= 1/2 × 12 × 9 + 1/2 × 12 × 9
= 54 + 54
= 108 cm2

Jawaban: A