No 3 sum

No 3 sum ZOAB = 1800-1260 2 ZDAC = ZDAB - ZOAB = 520 - 270 = 250 ZACB + ZCAB + ZABC = 1800 y + 270 + 520 = 1800 = 1800 -270 -520 y = 1010. EXERCISE (sum of angle in SABC) 1 If two angles of a quadrilateral are 400 and 1100 and the other two are in the ratio 3 : 4, find these angles. 2 , If the angles of a quadrilateral, taken in order, are in the ratio 1 : 2 : 3 : 4, prove that it is a trapezium. 3 If an angle of a parallelogram is two-thirds of its adjacent angle, find the angles of the parallelogram. (a) In figure (I) given below, ABCD is a parallelogram in which LDAB = 700, 4 ZDBC = 800. Calculate angles CDB and ADB. Rectilinear Figures

Hi!
Here is the answer to your question.
It is known that adjacent angles of a parallelogram are supplementary.
 
It is known that opposite angles of a parallelogram are equal.
∴∠A = C = 72° and B = D = 108°

Cheers!

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