Need help please can u help and explain liek last time @ilovemathbutneedhelp

Each side of an equilateral triangle is 25 cm, as shown.

What is the approximate height h of the triangle?

A.
18

B.
22

C.
36

D.
43

http://static.k12.com/calms_media/media/1422500_1423000/1422771/1/8ad8b5d4c037bda7af7ad0f1e9c55aeadb778896/MS_PA_131002_171220.jpg

Question

Need help please can u help and explain liek last time @ilovemathbutneedhelp 



Each side of an equilateral triangle is 25 cm, as shown. 


What is the approximate height h of the triangle?
  
 A.
18
 
 B.
22
 
 C.
36
 
 D.
43


http://static.k12.com/calms_media/media/1422500_1423000/1422771/1/8ad8b5d4c037bda7af7ad0f1e9c55aeadb778896/MS_PA_131002_171220.jpg

anonymous · Answer

Well do you remember the Pythagorean Theorem?

anonymous · Answer

$$a ^{2}+b ^{2}=c ^{2}$$

anonymous · Answer

so we are solving for h

linn99123 · Answer

that pythagorean theorem is very confusing :/

anonymous · Answer

Using the fact that this is an Equilateral Triangle, when split in half it becomes a  30°–60°–90° triangle. Which we just talked about :D

linn99123 · Answer

okay and thank you for helping and breaking it down :]

anonymous · Answer

$$(\frac{ 25 }{ 2 })^2+h^2=25^2$$

anonymous · Answer

h = 21.6506350946 or 22

linn99123 · Answer

ok thank you i have one more and i get a break :D