SOLUTION: find the length of the secon base of a trapezoid with area 14 units height 4 units and base 4.5 units? Find the height of a triangle with are 12 square units and base 3 units?

Algebra ->  Polygons -> SOLUTION: find the length of the secon base of a trapezoid with area 14 units height 4 units and base 4.5 units? Find the height of a triangle with are 12 square units and base 3 units?       Log On


   

Question 179269: find the length of the secon base of a trapezoid with area 14 units height 4 units and base 4.5 units?
Find the height of a triangle with are 12 square units and base 3 units?

find the perimeter of an equilateral rectangle with area 1/16 square units?
Find the area of a circle with circumference 8 pi units?
Answer by monika_p(71) About Me  (Show Source):
You can put this solution on YOUR website!
1.find the length of the second base (a) of a trapezoid with area A=14 units height h=4 units and base b=4.5 units?
A=%28a%2Bb%2F2%29%2Ah multiply both sides by 2/h
2A%2Fh=a%2Bb subtract b
2A%2Fh-b=a
substitute for A, h, and b
a=2%2A14%2F4-4.5
a=2.5
2.Find the height (h) of a triangle with area A= 12 square units and base a=3 units?
A=1/2*a*h multiply both sides by 2/a
h=2A/a
h=2*12/3
h=8
3.find the perimeter (P) of an equilateral rectangle with area A=1/16 square units?
Equilateral means that all the sides are equal. Therefore, an equilateral rectangle is a square.
A=a^2
a=sqrtA
a=sqrt(1/16)
a=1/4
P=4a
P=4*1/4
P=1
4.Find the area (A)of a circle with circumference c=8 pi units?
c=d*pi
d=c/pi
d=8*pi/pi
d=8 diameter, d=2r, r-radius
A=pi*r^2=1/4*pi*d^2
A=1/4*pi*8^2
A=16*pi