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(besar ab dan bc sama)
11. a×t÷2= 15×8÷2=60
jawaban 10.c, Dan 11.a
Karena segitiga sama kaki, maka AB = BC
keliling = jumlah semua sisi
= AB + BC + CA
= 12 + 12 + 8
= 32 cm
No.11
Luas = x alas x tinggi
=
= 60 cm²