Abowl is in the shape of a hemisphere (half sphere) with radius 10cm. the surface of the water in the bowl has a radius of 7cm. how deep is the water? give you answer to 1 decimal place.

answer:

the other way is pythagoras' theorem.

diagram as above, show radius from centre to edge of water r=10. draw the right-angled triangle. label centre to surface x. pythag.=>

x^2 = 10^2 - 7^2

=100 - 49

=51

x=sqrt(51)

h= 10 - sqrt(51)

=2.9 we get the same answer! maths is like that!

brainliest

$4034.40

the perimeter of the field is the sum of the lengths of the four sides:

47 yd + 158 yd + 47 yd + 158 yd = 410 yd

the cost of 3 ft (1 yd) of fence is 3×$3.28 = $9.84.

so the cost of jake's wood perimeter fance is

(410 yd) × ($9.84 /yd) = $4034.40