Q40 of 113 Page 128

In Fig. 5.31, PQ||ST. Then, the value of x + y is

y + ∠ PQR = 180⁰ (Forms a linear pair)

⇒ y + 130⁰ = 180⁰

⇒ y = 50⁰

∠ QOS = ∠ TSO (Co-interior angle)

⇒ x = 85⁰

⇒x + y = 135⁰

In Fig. 5.30, which one of the following is not true?

In Fig. 5.30, which of the following is true?

In Fig. 5.32, if PQ||RS and QR||TS, then the value a is

Fill in the blanks to make the statements true.

If sum of measures of two angles is 90°, then the angles are _________.