In a rhombus PQRS,if PQ=PR,then `/_PQR` is

In a rhombus PQRS , PR and QR are the diagonals of the rhombus. If PQ=10 cm , then find the value of PR^2+QS^2 .

Construct a rhombus PQRS such that PQ=3.2 cm and PR=4.2 cm.

In rhombus PQRS, PQ =6.5 and angle QPS=75^@ , then find QR and angle PQR .