Answer:
A = 156.25 pi cm^2
Step-by-step explanation:
The circumference of a circle is given by
C = 2 * pi *r
25 pi = 2 * pi *r
Divide each side by 2 pi
25 pi/2 pi = 2 pi r / 2 pi
12.5 = r
We can find the area by
A = pi r^2
A = pi ( 12.5) ^2
A = 156.25 pi cm^2
Answer:
Point R
Step-by-step explanation:
Answer:
0.3 with the hat ? the answer is first no, then it's a repeated decimal.
Step-by-step explanation:
Square <span>polygon is always regular, other have some scenarios which makes them regular but they are not always regular.</span>
Given: sin theta = 2/5. This tells us that the lengths of the opp side and the hyp are 2 and 5 respectively. The adj side is found using the Pyth. Thm.: 5^2-2^2= 25-4 = 21, so that the adj side is sqrt(21).
The double angle formula for the sine is sin 2theta = 2 sin theta *cos theta.
In this particular problem, the sine of 2theta is 2*(2/5)*[sqrt(21) / 5], or:
(4/25)*sqrt(21).
