Answer:
20 cm
Step-by-step explanation:
Let a cm be the length of the side of equilateral triangle.
Use formula for the radius of inscribed circle into the equailteral triangle:

Hence,

Now, use formula for the circumscribed circle's radius:

Therefore,

<em>We just need to add the price of the desk and the tax rate</em>
249,99
<u> 6,25 +
</u><em>256,24 </em>← The Answer <u>
</u>
Answer:
a^2 + 2a + 2
Step-by-step explanation:
replace x with (a +1) everywhere in the equation
f(a+1) = (a+1)^2 + 1
➡
a^2 + 2a + 1 + 1
36
Step-by-step explanation:
5x is 15
x is 3
12 times 3 is 36