Opsi Jawaban:

Jawaban:

segitiga

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<Siku siku di C

keliling segitiga = 80 cm

perbandingan a : b : c = 8 : 15 : 17

misal a : 8x , b : 15x , c = 17x

k = a + b + c

80 = 8x + 15x + 17x

80 = 40x

40x = 80

x = 80/40 = 2

maka, alas = a = 8x = 8(2) = 16cm, tinggi = 15x = 15(2) = 30 cm, sisi miring = 17(2) = 34 cm

L = 1/2 × alas × tinggi

L = 1/2 × 16 × 30

L = 8 × 30

L = 240 cm²