(2 marks) Using formula Median= l + {(n/2 cf )/f }*h by putting the value of – (1) L=500 ,f=20 , cf=36 +x , h = 100 Ans- x = 9 , y = 15 (1) 25)Answer : (1) Let AB be the statue, BC be the pedestal, and D be the point on the ground from where the elevation angles are to be measured. In ΔBCD, (1) In ΔACD, (2) 26 )cosec280 cot280 + (2) – 1+1/1=2 (2) 27)Answer : (1/2) Radius (r2) at circular end = 4 cm Radius (r1) at lower circular end = 10 cm Slant height (l) of frustum = 15 cm (1) Area of material used for making the fez = CSA of frustum + Area of upper circular end (1) = (10 + 4) 15 + (4)2 π π = (14) 15 + 16 π π Therefore, the area of material used for making it is. (1.5) : 28)Answer Let the speed of the train be x km/hr. Time taken to cover 360 km hr (1) According to the given question, (2) However, speed cannot be negative. Therefore, the speed of train is 40 km/h
(2 marks) Using formula Median= l + {(n/2 – cf )/f }*h by putting the value of (1) L=500 ,f=20 , cf=36 +x , h = 100 Ans- x = 9 , y = 15 (1) 25)Answer : (1) Let AB be the statue, BC be the pedestal, and D be the point on the ground from where the elevation angles are to be measured. In ΔBCD, (1) In ΔACD, (2) 26 )cosec280 – cot280 + (2) 1+1/1=2 (2) 27)Answer : (1/2) Radius (r2) at circular end = 4 cm Radius (r1) at lower circular end = 10 cm Slant height (l) of frustum = 15 cm (1) Area of material used for making the fez = CSA of frustum + Area of upper circular end (1) = π (10 + 4) 15 + π (4)2 = π (14) 15 + 16 π Therefore, the area of material used for making it is. (1.5) 28)Answer : Let the speed of the train be x km/hr. Time taken to cover 360 km hr (1) According to the given question, (2) However, speed cannot be negative. Therefore, the speed of train is 40 km/h
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