For the following questions answer them individually
Circum-centre of ΔABC is O. If ∠BAC = 75° and ∠BCA = 80°, then what is the value (in degrees) of ∠OAC?
Smaller diagonal of a rhombus is equal to length of its sides. If length of each side is 4 cm, then what is the area $$(in cm^2)$$ of an equilateral triangle with side equal to the bigger diagonal of the rhombus?
What is the simplified value of $$\sqrt{\frac{cosec\theta}{cosec\theta-1}+\frac{cosec\theta}{cosec\theta+1}}$$ ?
The table given below shows the ratio of exports and imports of a country for 5 years.
 Total trade = exports + importsÂ
If the total trade of the country in year 3 was 1183 crore dollars, then what was the difference (in crore dollars) between exports and imports of the country in that year?
The total trade for Year 2 and Year 4 is same. If exports of Year 4 are 315 crore dollars, then what are the imports (in crore dollars) of Year 2?
Total trade of Year 1 is twice of the total trade of Year 5. If total trade of Year 1 is 5700 crore dollars, then what is the difference (in crore dollars) in exports of Year 1 and Year 5?
The total trade of 5 years is 3800, 3600, 2800, 3900 and 5000 crore dollars respectively. What is the difference (in crore dollars) in the average exports and average imports respectively?