Temen tolong bantu saya menjawab pertanyaan ini

PQ = 15
QR = 17
PR = 8

s = 15+17+8/2=40/2=20

L = √s(s-a)(s-b)(s-c)
=√20.(20-15)(20-17)(20-8)
=√20.5.3.12
=√3600
= 60 cm^2

jari jari lingkaran luar = abc/4L = PQxQRxPR/4L
= 15x17x8/4x60
=2.040/240
=10cm