Current location - Training Enrollment Network - Mathematics courses - A simple junior high school math problem (trigonometric function! )
A simple junior high school math problem (trigonometric function! )
Firstly, make an isosceles Rt triangle, let the right angle side be equal to or equal to 1 (or equal to a), and the hypotenuse be equal to the root number 2;

When the hypotenuse extends to one end, the external angle adjacent to the acute angle is135; Then its bisector intersects with the hypotenuse to form a right triangle.