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keliling = sisi1+sisi2+sisi3= 13+13+10
luas= 1/2 10x13
=130:2
=65
36 = 10 + 2 s
36-10 = 2 sisi
26/2 = sisi
13 cm = sisi sama kakinya
tinggi ² = sisi kaki² - alas²
tinggi ² = 13² - 5²
tinggi² = 169 - 25
tinggi = √144 = 12 cm
Luas = 1/2 . alas . tinggi
Luas = 1/2 . 10 . 12
Luas = 10 . 6
Luas = 60 cm²