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menggunakan rumus perbandingan l.segitiga
a × t = a × t
25 × t = 20 × 15
25t = 300
t = 12 cm
26.
t.segitiga² = 17² - 8²
= 289 - 64
= 225
t.segitiga = √225
= 15 cm
(BC - 11)² = 15² - 12²
= 225 - 144
= 81
BC - 11 = √81
BC - 11 = 9
BC = 9 + 11
BC = 20 cm
kell = 20 + 12 + 11 + 8 + 17
= 68 cm