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240=1/2xax24
240=12a
a=20 cm
cri pnjang kedua sisi yg sm kaki
=akar dari 24kuadrat+10kuadrat = akardr 676=26
jd keliling = a+b+c=26+26+20=72cm
alas=L:(tinggi:2)
=240cm²:(24cm:2)
=240cm²:12cm
=20cm
Cari pkek rumus phytagoras
c²=a²+b²
=10²+24²
=100+576
=676
c=√676
=26cm
Keliling=alas+sisimiring+sisimiring
=20cm+26cm+26cm
=20cm+52cm
=72cm
Semoga Membantu :-)