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PKO siku siku di K
OK = √(OP²- KP²)= √(15²-12²) = 9
Kelilin = 2(OK +KP) = 2(9+12) =2(21)= 42
13.
BDP siku sikuy di D
BD² = BP² -PD² = 13²-5²
BD = 12
BDO siku siksu di D
OB² = BD²+OD²= 12²+9²
OB = 15
14.
ABC siku siku di B
AC² = AB²+ BC²
AC² = 12² +9² = 225
AC = 15
R = (AB x BC x AC) / 4 L
R = (12x9x15)/(4)(54)
R = 7,5