**Definition**of An**Acute****Angle**. Any**angle**that measures greater than 0° and less than 90° is called an**acute****angle**. ∠ABC measures 30° and hence it is an**acute****angle**. Examples of**Acute**Angles.**Acute**angles measure less than 90° Therefore, 67°, 45°, 23°, 52°, 86°, 14° are all examples of**acute**angles. Dividing the right**angle**(90 ...Answer:

**Angle**A is**acute, angle**B is right, and**angle**C is obtuse.**Acute Angle**Triangle. If all the internal angles of a triangle are less than 90 degrees, then it is called an**acute angle**triangle. In the above figure, we can see, the three angles of the triangle are 69°, 85° and 26°. All three angles are less than 90 degrees.Parts of an

**Angle**. The corner point of an**angle**is called the vertex. And the two straight sides are called arms. The**angle**is the amount of turn between each arm. How to Label**Angles**. There are two main ways to label**angles**: 1. give the**angle**a name, usually a lower-case letter like a or b, or sometimes a Greek letter like α (alpha) or θ (theta)**Reflex Angle****Definition**. As we have already discussed in the introduction, the**reflex angle**is the**angle**greater than 180 degrees and less than 360 degrees. A**reflex angle**is equal to the sum of 180 degrees and any of the primary angles (**acute**, right and obtuse angles). Therefore,**Reflex angle**= 180° +**Acute****angle**;**Reflex angle**= 180° + Right ...**Central angle**is the**angle**subtended by an arc of a circle at the center of a circle.The radius vectors form the arms of the**central angle**. In other words, it is an**angle**whose vertex is the center of a circle with the two radii lines as its arms, that intersect at two different points on the circle.The right-angled triangle

**definition**of trigonometric functions is most often how they are introduced, followed by their definitions in terms of the unit circle. Right triangle**definition**. For a right triangle with one**acute****angle**, θ, the**tangent**value of this**angle**is defined to be the ratio of the opposite side length to the adjacent side ...When two rays intersect and form a 90˚

**angle**or are perpendicular to each other at the intersection, they are said to form a**right angle**.**Right Angle****Definition**. The**angle**formed by two lines that are perpendicular to each other is called a**right angle**. A**right angle**is equal to 90° and is in the shape of the letter "L".