tolong no 4 aja pake jalan!

a. PR=PT=TS=RS
PR=10 cm TS=10 cm
PT=10 cm RS=10 cm

b. PS=2PO c. RT=2RO
PS=2×6 cm RT=2×8 cm
PS=12 cm RT=16 cm

d. <PRT=1/2PRS
=1/2×110°
=55°

<RST=180°-110°
= 70°

<STR=<PRT
=55°