- How many right angles does an equilateral triangle have?
- What are the kinds of Triangle according to angles?
- What is the relationship between the two acute angles in a right triangle?
- Are all complementary angles congruent?
- How do you know if an angle is supplementary or congruent?
- How do you know if angles are supplementary to each other?

## How many right angles does an equilateral triangle have?

In geometry, an equilateral triangle is a triangle in which all three sides have the same length. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°….

Equilateral triangle | |
---|---|

Area | |

Internal angle (degrees) | 60° |

## What are the kinds of Triangle according to angles?

Six Types of Triangles

Based on their Sides | Based on their Angles |
---|---|

Scalene Triangle | Acute Triangle |

Isosceles Triangle | Obtuse Triangle |

Equilateral Triangle | Right Triangle |

## What is the relationship between the two acute angles in a right triangle?

Two acute angles of a right-angled triangle are “Complementary Angles.” Consider a right triangle ABC with angle B as a right angle. The sum of all three angles in a triangle is equal to and one angle in a right triangle measures .

## Are all complementary angles congruent?

No, complementary angles are not always congruent. Complementary angles are angles with measures that sum up to 90°.

## How do you know if an angle is supplementary or congruent?

Two angles are supplementary if the sum of their measures is 180. An isosceles triangle has at least two congruent sides. If two collinear segments adjacent to a common segment are congruent, then the overlapping segments formed are congruent.

## How do you know if angles are supplementary to each other?

If the measure of the angle is twice the measure of the other, find the measure of each angle.

- Let the measure of one of the supplementary angles be a .
- Measure of the other angle is 2 times a .
- So, measure of the other angle is 2a .
- If the sum of the measures of two angles is 180° , then the angles are supplementary.