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k = 4s
s=k/4
s=86/4
s=21,5
lalu cari d1
d1= 2 (√21,5² x 8²)
d1=2 √462,25 - 64
d1=2 √398,25
d1= 2 x 19,96
d1 =39,92
luas = 1/2 (d1 xd2 )
luas = 1/2 (39,92 x 16)
luas = 1/2 x 638,72
luas = 319,36 cm
s=68:4=17
d1=16
1/2d2=√s²-1/2d1²
1/2d2=√17²-8²
1/2d2=√289-64
1/2d2=√225 =15
d2=30
luas= d1.d2 /2
luas= 16.30 /2
luas= 240 cm²