Question

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Answer 1

Answer:

(a) In quadrilateral abcd

LABC+LBCA+LCDA+LDAB=360°....Angle sum property of quadrilateral.

70°+80°+60°+x=360°

210°+x=360°

x=150°

(b) In parallelogram PQRS

Angel S+ Angle x=180°..... Adjacent angles of parallelogram are supplementry

Angle x=180°-105°

x=75°

Angle S= Angle Y =105°......Opposite angles of parallelogram are equal.....