1.

`angleQPR` में, बिंदु A,B तथा C क्रमश: भुजा PQ तथा QR पर इस प्रकार लिए गए की QC=AC तथा ,CR=CB, यदि `angleQPR=40^(@)` है, सब `angleACB` ज्ञात करे?A. `140^(@)`B. `40^(@)`C. `70^(@)`D. `100^(@)`

Answer» Correct Answer - C
`=2x+2y-180^(@)`
`=2(x+y)-180^(@)`………….(iv)
Put the value of equation, (i) in equation (iv)
`angleACB = 2 xx 140^(@)-180^(@)`
`=280^(@)-180^(@)`
`angleACB=100^(@)`


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