5. Dana is creating an art project. She is drawing circles within circles. Each circle that she draws is.8 the size of the
previous circle. If her initial circle had a diameter of 60 cm.
How large is the diameter of the 3rd circle she draws? (You
must use one of the formulas on the reference sheet).
Arithmetic Sequence
an = a + (n-1)d
Geometric Sequence
4, = appon-1
Geometric Series
S
ay-ar"
wherer #1
n
1-r

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.

cant

step-by-step explanation: there is no picture