no.13 tolong bantuuuuuu hehe

Panjang Garis singgung Dalam

AB= 24 cm
OP= 30 cm
PB = 12 cm

OP² = (AB)² +(PB+OA)²
30² = (24)² + (12+OA)²
(12+OA)² = 30² -24² = 342
12 + OA = √(342) = 18
OA = 18-12
OA = 6 cm

luas ling O  : luas ling P = OA² : PB² = 6² : 12² = 1 : 4