# Formulate and prove the properties of the angles of a right triangle.

September 25, 2021 | education

| Right-angled triangle – a triangle with a right angle, which is 90º, and two acute angles.

1) In a right-angled triangle, the sum of two acute angles always equals 90º, since the sum of all the angles of a triangle is 180º, which means: 90º + aº + bº = 180º.

2) The side opposite the 30º angle is half the hypotenuse.

3) In a right-angled triangle, the sides and angles are connected with each other using: sin, cos, tg, ctg.

4) If the leg is half the hypotenuse, then the opposite angle is 30º.

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