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AB= alas sgitiga
AC=BC
a=b
kell = 2a+c
24=2a+c
c=24-2a
CD= tinggi alas
CD²=1/2 AC²+1/2BC²-1/4AB²
4²=1/2a²+1/2a²-1/4 .c²
16=a²-1/4(24-2a)²
16=a²-1/4(576 - 96a +4a²)
16=a²-1/4 x 4 ( 144-24a+a²)
16=24a-144
24a=144+16
a=160/24
a=20/3
a=b
maka c= 24-2.20/3
c= 72/3-40/3
c=32/3
itu gan jawabanku..nyoba pakai garis berat.
namun saya moho. maaf kalo salah gan..