Math problems in the second day of junior high school (Pythagorean theorem)

The sum of the areas of two small triangles is equal to the area of the big triangle.

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

(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.

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