In the parallelogram PQRS given find anle SQR - JAMB Mathematics 2006 Question

In the parallelogram PQRS given, find anle SQR

< QRS = 30^o(corresponding < ), < QSR = 50^o

< SQR = 180^o - (30 + 50)^o (Sum of < S in a (\bigtriangleup))

180^o - 80^o = 100^o