Sina= length of opposite side/length of hypotenuse.

Cosa= length of adjacent side/length of hypotenuse.

Tga= length of opposite side/length of adjacent side

Ctga= length of adjacent side/length of opposite side

Check the manual of inverse trigonometric function again and get the size of angle a.

Then the size of the other acute angle is calculated by using the complementarity of the two acute angles of the right triangle (the sum is equal to 90 degrees). ?

In addition, your understanding of edges and hypotenuses is wrong.

A hypotenuse is an edge sandwiched between two acute angles.

Adjacent edge refers to the desired edge sandwiched between an acute angle and a right angle (right angle edge).

And the opposite side refers to another right-angled side, that is, the side opposite to the required acute angle?

Need to buy a calculator called scientific calculator, which has trigonometric function and inverse trigonometric function. It turns out that Sharp's is 55 yuan, but now I don't know what the price is.

Baidu, look at the trigonometric function table.

You can use your calculated trigonometric function value to find out the corresponding angle. Link for reference/view/fb989d707fd5360cba1adb3e.html &; nbsp

draw

As we all know, we can find the opposite side and the hypotenuse.

Sina =3/5=0.6

In the link I gave you, you can find that sina=0.6 corresponds to an angle of about 37 degrees.

Or use a calculator.

Each calculator has a different operation method, so you need to read the instructions.