Question

Here is the picture of the problem- Only 6th grade math

Answer 1

h= 7/6 mm

Explanation:

hello :

the area is : A= (b+B)×h/2

calculate h the height : 2A = (b+B)×h

so: h = 2A/(b+B)

you have : A=21/5 and b= 3 and B= 21/5

h= 2(21/5)/(3+21/5)

h= (42/5) /(36/5)

h= 42/36

h= 7/6 mm