Question

triangle PQR is a triangle right angled at Q if it the length of PR is 29 cm and QR is 21 cm find out the length of PQ​

Answer 1

Answer:

PQ=20cm

Step-by-step explanation:

by pythagoras theorem:

PR^2=PQ^2+QR^2

841=PQ^2+441

PQ=20

Answer 2

Answer:

Step-by-step explanation:

$PR^{2}$=$PQ^{2$+$QR^{2}$

$29^{2}$=$PQ^{2}$+$21^{2}$

$PQ^{2}$=$29^{2}$-$21^{2}$

$PQ^{2}$=841-441

$PQ^{2}$=400

PQ=$\sqrt{400}$

PQ=20