1.

In `Delta PQR,/_P=40^(@)` and `/_ Q=60^(@)`. Find `/_R`

Answer» In a triangle , the sum of the angles is equal to `180^(@)`.
`/_P+/_Q+/_r=180^(@)` ltBRgt `40^(@)+60^(@)+/_R=180^(@)implies/_R=80^(@)`


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