I need help with math please help

1: 78.5

2: 7,850

1: we know the radius is 5, so we put it in the expression, making 3.14x5 to the second power, which makes 25 ( because 5x5) so 3.14x25=78.5

so our area is 78.5m

2:our radius is 50, so when we put it in the expression 3.14x50 to the second power we get 2500, so agian we do 3.14x2500=7850

so our area is 7850mm

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584