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= ½(15 cm+ 20 cm+ 25cm)
=½×60 cm
= 30 cm
L∆ = ½× a × t
= ½ × 15 cm × 20 cm
= 15 cm × 10 cm
=150 cm²
r = L / s
= 150 cm / 30 cm
= 5 cm
jadi, jari- jari lingkaran dalam segitiga adalah 5 cm