Question

Triangle XYZ is right -angled at Z. Calculate the length of YZ, if :

$PQ=8\cdot 5cmandQR=8\cdot 4cm$

Answer 1

In $△PQR$,
$P{Q}^2=P{R}^2+R{Q}^2$
$(8.5{)}^2=P{R}^2+(8.4{)}^2$
$P{R}^2=72.25-70.56$
$P{R}^2=1.69$
$PR=1.3$ cm

$10PR=13$ cm