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=√25²-(5+2)²
=√625-49
=√576
=24
ra = 5cm
rb = 2cm
s = 25cm
Dit: d....?
d² = s² - (ra + rb)²
d² = 25² - (2 + 5)²
d² = 625 - 49
d² = 576
d = √576
d = 24 cm
panjang garis singgung persekutuan dalamnya = 24cm