Question

Water is poured into a hemispherical bowl with a radius of 30cm. The water's depth is 12cm. Calculate the radius of the surface of the water
draw a semi-circle
mark in the centre O and label the horizontal radius 30
If the water level is 12 cm deep then the distance from the centre to the water level is 18 cm

draw in a radius to the end of the water level and you have a right-angled triangle, with sides 18 and r, where r is the radius of the water-level, and the hypotenuse is 30

go for it !

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