Answer:
A
Step-by-step explanation:
Let x ml be the amount of paint color B mixed with 40 ml of paint color A.
In 40 ml of paint color A are 15% of black pigment, so there are
of black pigment.
In x ml of paint color B are 60% of black pigment, so there are
of black pigment.
In total we het x+40 ml of mixture. There are 25% of black pigment that is
Thus,
The radius is √25=5 in this case.
find the area of each triangles first. (the pentagon can be divided into 5 isosceles triangles)
the two equal sides are 5 each, the angle between them is 360/5=72 degree, so the base side is 2*5*sin36, and the height is 5*Cos36
the area of each triangle is (1/2)*2*5*Sin36*5*Cos36
the total area of the 5 triangles is: 5*(1/2)*2*5*Sin36*5*Cos36
use a calculator: A≈59.44
Answer:
36.56
Step-by-step explanation:
the area of a circle is r^2×pi (here 2^2×pi) then add the area of the middle rectangle (so 4×6)
Answer:
-6r+5
Step-by-step explanation:
