In the following figure, ^@ AD = AB, ^@ ^@ \angle DAB = \angle DCB = \angle AEC = 90^\circ ^@ and ^@ AE = 6 \space cm. ^@ Find the area of the quadrilateral ^@ ABCD. ^@
Two neighbours have adjoining houses as shown below. The houses are fenced with one common side. If the cost of fencing is ₫15.90 per meter, find the total cost of fencing both the houses.
The graph below shows the temperature (in degrees Celsius) over 10 weeks in Hai Phong. Calculate the maximum range of variation (the difference between highest and lowest temperature).
Hoang's roll number is a two digit number. His friend Annie's roll number has the same digits as Hoang's roll number, but with digits interchanged. If they add their roll number, and divide the sum by 11. Find the remainder of this division.
A.
0
B.
1
C.
2
D.
Can not be determined without knowing the roll number
It is Trinh's birthday today and she distributed toffees to her classmates. The toffees were in a bag as shown below. Trinh's puts her hand in the bag and takes out a toffee without looking. What is the probability that she picked out a striped toffee?
of the principal. If the numbers representing the rate of interest (in percent) and time (in years) be equal, then what is the time, for which the principal is lent out?
The difference between the compound interest, compounded annually and the simple interest on a certain sum for ^@2 \space years^@ at ^@ 11 \% ^@ per annum is ^@ ₫ 363. ^@ Find the sum.
During a day, the hour hand and the minute hand of a clock forms a right angle, at multiple times. For example, the two hands form a right angle at 9 am. How many times during a day (24 hours) will the two hands form a right angle?
Vietnam
