As you can see there are two triangles but it can be done calculating just for one. First we must understand how formula for area of triangle works.
Where 
represents base (hypotenuse) and 
as height of the triangle.
We know that:
Using this data we fill the formula.
Hope this helps.
r3t40
Answer:
73.4846922835 = 73.5 and no it is not a perfect square 5400/100 = 54
Answer what? This question? Oh, I'm answering it right now. Did you have another question out? Well, I can't see it.
Answer:
area of a circle πr^2
r = 10/2 r = 5
π5^2 = 78.5
area of the square length X width
7 x 7 = 49
78.5 - 49 = 29.5
shaded region = 29.5 square cm
66,190 is the Answer if you add 80 to 110 and then add 190 to 66000
