tolong di jawab soal ini ya... yg 1c hrs pake cara...

Dik : BD = 6 cm
        BC = 14 cm
Dit : a) AD = ...?
       b) AB = ....?
       c) L ABC = ....?
Jwb :
a) AD = √BD x CD
= √6 x (BC - BD)
= √6 x (14 - 6)
= √6 x 8
=√48

b) AB = √BD x BC
= √6 x 14
= √84

c) L ABC = 1/2 x AB x AC
#AC = √CD x CB
= √8 x 14
= √112
= 1/2 x √84 x √112
= 1/2 x √9.408
= √4704

AB²=BD x BC
AB²=6 x (14+6)
AB=√120
AB=√4√30
AB=2√30 cm

AD²=AB²-DB²
AD²=(2√30)²-6²
AD²=120-36
AD=√84
AD=√4√21
AD=2√21 cm

AC²=BC²-AB²
AC²=20²-(2√30)²
AC²=400-120
AC=√280
AC=√4√70
AC=2√70 cm

L=½xABxAC
L=½x2√30 x 2√70
L=√30x2√70
L=2√2100
L=2√100√21
L=20√21 cm²