$\displaystyle\\
\begin{cases}
R_1 = 3R_2\\
\pi R_1^2 +\pi R_2^2=12\pi ~~~\Big|~~:\pi 
\end{cases} \\ \\ 
\begin{cases} 
R_1 = 3R_2\\
R_1^2 + R_2^2=12 
\end{cases} \\ \\ 
(3R_2)^2+ R_2^2=12 \\ \\ 
9R_2^2 + R_2^2=12 \\ \\ 
10R_2^2=12\\\\
R_2^2 = \frac{12}{10} = \frac{6}{5} \\ \\ 
R_2 = \boxed{\sqrt{\frac{6}{5}} } \\ \\ 
R_1 = \boxed{3\sqrt{\frac{6}{5}} }$

7 0

3 years ago

Anne is planting a garden she is putting up a fence. The fence is 12.4 metres long and

Dmitrij [34]

To find the perimeter you do length + width so you do 12.4 + 5.9 to get the perimeter.

5 0

3 years ago

Read 2 more answers

The volume of which shapes can be found using the formula V = Bh?

Crazy boy [7]

Answer:

Triangular pyramid and Rectangular prism

Step-by-step explanation:

There are several different uses of the formula V = BH. For example, we used the formula V = BH for a cylinder, a rectangular prism, and a triangular pyramid. But be careful! All of the elements in the formulas don't mean the same! I really hope this helps you a bit!

5 0

4 years ago

Can a triangle have the sides with the given lengths of 2 in, 4 in, 6 in​

Can a triangle have the sides with the given lengths of 2 in, 4 in, 6 in