Answer:
Hypotenuse square = 8cm
Base square= 5cm
Altitude square= a
= hyp square - Base Square
= [tex]8^{2}[/tex] - [tex]5^{2}[/tex]
= 8 x 8 - 5 x 5
= 64 - 25
= 39
= 6.24
Perimeter of The Triangle= 8cm + 5cm+ 6cm
= 19cm
19 to the nearest tenth --> 20cm
HOPE THIS HELPS
