A trapezium PQRS is such that QR=4cm,PS=8cm angelPQR=105°angelSQR=135°QR//PS.if the height of the trapezium is 5cm use a ruler and a pair of compasses to construct trapezium PQRS

Answer 1

construct a 15° by bisecting a 60° angle twice.
Now you can use that to make the 105° angle
Note that 135 = 90+45. That makes the other angle easy.