Tolong bantu dongg makasi​

Jawaban:

PGSPL = √(Jp² – (r1 – r2)²)

PGSPL = √(20² – (15 – 7)²)

PGSPL = √(400- 64)

PGSPL = √336

PGSPL = √16 × √21

PGSPL = 4√21 cm