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S= 1/2 kll segitiga
= 1/2 (12+10+8)
= 15 cm
L = akar 15 (15-12) (15-10) (15-8)
= akar 15. 3. 5. 7
= 15 akar 7
a. jari-jari lingkaran dalam (r) = L / S = 15 akar 7 : 15 = akar 7
b. ps = 10 - akar 7
Qt = 12 - akar 7
ru = 8 - akar 7
c. oq pake pitagoras...