Which problem can be solved using this equation?

6x + 10 = 130
a) tonya had candy to share with her friends. she took 10 pieces for herself and divided the other pieces evenly among her friends. how many pieces did each friend receive?
b) tonya had candy to share with her friends. she took 10 pieces for herself and divided the other pieces evenly among her 6 friends. how many pieces did each friend receive?
c) tonya had candy to share with her friends. she took 6 pieces for herself and divided the other pieces evenly among her 10 friends. how many pieces did each friend receive?
d) tonya had candy to share with her friends. she took a few pieces for herself and divided the other pieces evenly among her 6 friends. how many pieces did each friend receive?

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.

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.