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BD=√256
BD=16
AD=BD - AB
AD=16 - 11
AD=5
segitiga besar=BDC
BDC=1/2 x alas x tinggi
BDC=1/2 x 16 x 12
BDC=96
segitiga kecil=ADC
ADC=1/2 x alas x tinggi
ADC=1/2 x 5 x 12
ADC=30
maka
luas ∆ABC=∆BDC - ∆ADC
ABC=96 - 30
ABC=66
ABC=1/2 x alas x tinggi
ABC= 1/2 x BC x AE
66= 1/2 x 20 x AE
66= 10 x AE
AE= 6,6