MO SK/CZ Z9–I–3

John had the ball that rolled into the pool, and it swam in the water. Its highest point was 2 cm above the surface. The diameter of the circle that marked the water level on the surface of the ball was 8 cm. Find the diameter of John ball.

Correct result:

D =  10 cm

Solution:

r2=(8/2)2+(r2)2 r2=16+r24r+4 0=204r r=20/4=5 cm D=2 r=2 5=10 cm



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Showing 1 comment:
#
Math student
I need more explanation as to where these equations are coming from.

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