tlg dijawab ya no 10 pakai cara ya

K = Ab + Ac + Bc
20 = 8 + 5 + Bc
20 = 13 + Bc
Bc = 20 -13
Bc = 7 cm

Ae/Ab = De/Bc
Ae/8 = 3,5/7
7Ae = 8 x 3,5
7Ae = 28
Ae = 28 / 7
Ae = 4 cm

Ad/Ac = De/Bc
Ad/5 = 3,5/7
7Ad = 3,5 x 5
7Ad = 17,5
Ad = 2,5 cm