The area of a circle (a) is given by the formula where r is the circle's radius. the formula to find r is . if and , r is centimeters.

For this case we have by definition, that the area of a circle is given by:

Where:

A: It is the area of the circle

r: It is the radius of the circle

We cleared the radius of the circle:

We choose the positive value:

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

y=x+9

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step-by-step explanation: