## O is the Centre of a Circle and AB a Diameter. ABCD is a Cyclic Quadrilateral. ∠ABC=65°, ∠DAC=40°, then the Measure of ∠BCD is ______. a)75° b)105° c)115° d)80°

O is te centre of a circle and AB a diameter ABCD is a cyclic quadrilateral. ∠ABC=65°, ∠DAC=40°, then the measure of ∠BCD is ______. a)75° b)105° c)115° d)80° Answer : 115° Explaination: Given: ∠ABC=65° ∠DAC=40° ∠BCD= ?? ∵ ∠ACB is angle in a semicircle. ∴ ∠ACB = 90° ∵ Read more…

## If tan∝ + cot∝ = 2, then the value of tan13∝ + cot13∝ is ______

If tan∝ + cot∝ = 2, then the value of tan13∝ + cot13∝ is ______. a) 13 b) 2 c) 1 d) 0 Answer : b ) 2 Explaination : Given : tan∝ + cot∝ = 2 ⇒ tan∝ + 1/tan∝=2 ⇒ tan2∝ + 1/tan∝ = 2 ⇒ tan2∝ + 1 Read more…

## In a partnership business, the ratio of share of profit of two friends is 1/2 : 1/3, then the ratio of their principal is –

WBBSE – 2019 Solution : Ratio of the principal = Ratio of profit share                                        = 1 / 2 : 1 / 3                                        = ( 6/2 ) : ( 6/3 )                                        = 3 : 2 The required answer is ( b ) 3 : 2

## If ( p + q ) = √13 and ( p – q ) = √5 then the value of pq is –

WBBSE – 2019 Solution: Given that p + q = √13 Squaring both sides, we get ( p + q )2 = 13 ( p – q )2 + 4 pq = 13 ( √ 5 )2 + 4pq = 13 5 + 4pq = 13 4pq = 13 – Read more…

## West Bengal Board of Secondary Education, Class – X Mathematics Question Paper – 2019 ( Urdu Version + English Version )

Class – 10, WBSSE Question Paper – 2019 Subject : Mathematics ( West Bengal Board of Secondary Education )  Here is the question paper of mathematics for the year 2019 ( West Bengal Board of Secondary Education )