the awnser is -6
im very sure let me know if im wrong.
First, we find the area of the circle.
A = pi * r^2
A = pi * (1 cm)^2
A = pi cm^2
The area of the circle is pi cm^2.
The area of the triangle is also pi cm^2.
Now we use the area of a triangle.
A = (1/2)bh
(1/2)bh = A
(1/2)(3 cm)h = pi cm^2
(3 cm)h = 2pi cm^2
h = (2/3)pi cm
The exact height is 
If you want an approximate height, then it is 2.09 cm.
Factoring Example: find the GCF of 20,50,120
Just find the factors of each number
The factors of 20 are 1,2,4,5,10,20
The factors of 50 are 1,2,5,10,25,50
The factors of 120 are 1,2,3,4,5,6,8,10,12,15,20,24,30,40,60,120
the common factors of 20,50,120 are 1,2,5,10 just the numbers common to all three.
the greatest common factor of 20,50,120 is 10
For the values of 36,144
is GCF = 36