Answer:
8
Step-by-step explanation:
Check the picture below.
is simply a 9x9 square, so its perimeter is simply 4*9.
Answer:
The height of the equilateral triangle is 
Step-by-step explanation:
we know that
An equilateral triangle has three congruent sides, and three congruent angles that each measure 60 degrees
To find out the height of an equilateral triangle, apply the Pythagoras Theorem in the right triangle ABD
Remember that the height of an equilateral triangle bisects the base.
see the attached figure to better understand the problem

substitute the given values

Solve for BD




simplify
`
therefore
The height of the equilateral triangle is 
-5.31 is the awnser to your problem
Answer:
An arithmetic sequence is a list of numbers with a definite pattern. If you take any number in the sequence then subtract it by the previous one, and the result is always the same or constant then it is an arithmetic sequence.