Find the measure of arc ac.
angle c=57
arc bc=114
formula is 360 -57 - 114 =189/2=94.5 for ac ?

There is a theorem that states that the arc of an inscribed angle(one that has its vertex on the circle, point C) is 2 times its measure. So therefore arc AB would be Angle C x 2 = 57 * 2 = 144.

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You must find the surface of the block therefore 98187 dived by 5628 = 583m squared