tolong dibantu ya teman..

mungkin

BC=akar(12^2+16^2)
=akar(144+256)
=akar(400) =20
luas ABC 1= 1/2×AB×AC
=1/2× 12×16 = 96
luas ABC2=ABC 1
1/2× BC×AD=96
1/2×20× AD=96
AD= 96÷10= 9,6