Please answer that and help me!! I’ll give you brainliest if u answer it good.

The current area of the circle is 81π in².

They want to " 'decrease' " the radius to 9 in.

First, find the current radius for the current circle.

Areas of circle = πr²,

81π = πr²

First, divide π from both sides of the equation:

(81π)/π = (πr²)/π

r² = 81

Isolate the variable, r. Root both sides of the equation:

√(r²) = √(81)

r = √( 9 * 9) = 9

The radius currently is 9 in.

The NBA is not making any changes at all, therefore the question will be void. (Note that the other answer choice is -9, however, you cannot have a negative measurement, therefore, the answer is voided).

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answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq