To find the missing measurement of a shape you have to look at the opposite side and see what it adds up to. Then you make that side and the other missing side add up to the opposite side
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You are supposed to use the fact that the sum of all three angles is 180°.
U can multiply
Unless there is a given measurement of the lengths of the sides of the figure (ex. cm., mm., in.) you would say units, and put a little 2 as an exponent because you need to write square units.
10 cm
all you do is find the area of the circle... if you mean find the squares area, find the area of the circle, and then the square's area and subtract the squares area to the circles area