1. Tentukan Panjang BD dan BC 2. Hitunglah Panjang EF

1. AD/BD = BD/DC
9/BD = BD/4
BD² = 36
BD = 6 CM

BC = √BD²+DC²
= √6²+4²
= √36+16
= 7,2 CM


2. EF = (AE X DC) + (AB X DE) / AE + DE
= (9 X 15) + (28 X 4) / 9+4
= 135 + 112 / 13
= 247 / 13
= 19 CM