Tolong cari EC dong​

Jawab:

kesebangunan

ΔADE sebangun ΔABC

<A =< A  (berimpit)

<D = <C = 105°

<E = <B

perbandingan sisi

AE/AD =  AB/AC

10/8 = (AD+ DB)/ (AE + EC)

10/8 = (8 +12)/ (10 + EC)

10/8 = (20)/ (10 + EC)

10(10 + EC) = 8(20)

100 + 10 EC = 160

10 EC = 160 – 100

10EC = 60

EC= 6 cm