Let the side length of a regular triangle be 2a.
rule
There can be an angular relationship to prove that the height on any bottom edge is
(root number 2)a
Area s= 1/2
*
2a
*
(root number 2)a
=
(radical number 2)a*a
Namely:
The area is
Length of side
multiply by
1/2
*
(root number 2)
Let the side lengths of right angles be a respectively.
b
Length of hypotenuse c
I can't see your picture, please correspond to it yourself. )
have
a*a+b*b=c*c
1/2
* (radical number 2)a*a+
1/2* (root number 2)b*b =
1/2 * (root number 2)c*c
Some symbols cannot be played.
It depends on your understanding.
Besides, check for yourself.
I haven't done junior high school questions for a long time