Jawabanmu

2014-03-18T19:58:13+07:00
GSPD = √13² - (3+2)²
= √169 -5²
= √169 - 25
= √144
=12 cm
2014-03-18T20:06:36+07:00
D²=p²-(R+r)²
d²=13²-(3+2)²
d²=169-25
d²=√144
d=12 cm