3 cm The diameter of the semi-circle is 3 cm. (semi-circle is half of a circle).
Determine the area of the serai – circle. Give your answer correct to two decimals.​

d_3cm

form=3.142*3

since 3 is diameter of half circle

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we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4