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1/2 x alas x tinggi = 1/2 x BC x AB
= 1/2 x 9 x 8 = 36 cm²
b. keliling segitiga = AB+BC+AC
= 9 + 8 + √145 = 17 + 3,74 = 20,74
panjang BC = 9 cm
panjang AC √145
a.) luas segitiga
1/2 . a . t
1/2 . BC . AB
1/2 . 9 . 8
9 . 4
= 36 cm²
( semoga membantu,,,, cuma itu aja yang tau :D )