Question

XY is the diameter of a semicircle. XY is of length 10.2cm.

Answer 1

$\\ \sf\longmapsto ZY^2=XY^2-XZ^2$

$\\ \sf\longmapsto ZY^2=10.2^2-5.9^2$

$\\ \sf\longmapsto ZY^2=104.04-34.81$

$\\ \sf\longmapsto ZY^2=69.23$

$\\ \sf\longmapsto ZY=\sqrt{69.23}$

$\\ \sf\longmapsto ZY=8.3cm$

Answer 2

easy, u have to do

10.2 cm - 5.9 cm

and that will equal 4.3

hope that helped! :]