What is the meaning of alternate exterior angle?

Alternate Exterior Angles – Alternate exterior angles are the pair of angles on the outer side of the two parallel lines but on the opposite side of the transversal.

What is alternate exterior angle with example?

When two lines are crossed by another line (called the Transversal): Alternate Exterior Angles are a pair of angles on the outer side of each of those two lines but on opposite sides of the transversal. In this example, these are two pairs of Alternate Exterior Angles: a and h.

What is the alternate exterior angle of 2?

Two alternating exterior angles are given as (2x + 10) ° and (x + 5) °. Check whether the angles are congruent. Alternating exterior angles are equal when the transversal crosses two parallel lines. Therefore, equate the two angles.

Which angle is an alternate exterior angle to ∠ 8?

∠8 is on the outside of the bottom parallel line, and to the right of the transversal. That means ∠1 is its alternate exterior angle partner. The Alternate Exterior Angles Theorem tells us it is also 130° !

What is the vertical angle of ∠ 8?

65°

6 and 8 are vertical angles and are thus congruent which means angle 8 is also 65°.

Are alternate exterior angles congruent?

They are located “outside” the two parallel lines but on opposite sides of the transversal, creating two pairs (four total angles) of alternate exterior angles. Alternate exterior angles are congruent, meaning they have equal measure.

How do you find alternate angles?

Video quote: But if you can spot that these two angles are actually alternate angles we know that they are equal they help they're the same size so angle X must be 45 degrees as well.

What is in the scalene triangle?

A scalene triangle is a triangle that has three unequal sides, such as those illustrated above.

What is a obtuse equilateral?

The angles in an equilateral triangle are all 60 degrees. 1803=60. since all three angles are equal divide the total degrees in an triangle by 180 by 3. An obtuse angle is greater than 90 degrees. 60< 90 so an equilateral triangle can not have an obtuse angle.

What does isosceles mean in math?

mathematics. : a triangle in which two sides have the same length.

What is a right equilateral?

In an equilateral triangle, all the sides are equal. If we use the longest side theorem which say in the triangle the longest side is across the largest angle. Since all the sides are equal then the angles must be equal too. So we can’t have an Right angled equilateral triangle.

What are the 7 types of triangles?

To learn about and construct the seven types of triangles that exist in the world: equilateral, right isosceles, obtuse isosceles, acute isosceles, right scalene, obtuse scalene, and acute scalene.

What are the 3 main types of triangles?

There are three types of triangle based on the length of the sides: equilateral, isosceles, and scalene. The green lines mark the sides of equal (the same) length.

Can isosceles triangles be right?

In an isosceles triangle, two sides are the same length. An isosceles triangle may be right, obtuse, or acute (see below). In a scalene triangle, none of the sides are the same length.

Can a triangle be scalene and obtuse?

A scalene triangle can be acute-angled or obtuse-angled or right-angled.

Can an obtuse triangle be equilateral?

Special facts about obtuse triangle:



Therefore, an equilateral angle can never be obtuse-angled. A triangle cannot be right-angled and obtuse angled at the same time. Since a right-angled triangle has one right angle, the other two angles are acute.

What is an oblique triangle?

An oblique triangle is any triangle that is not a right triangle. It could be an acute triangle (all threee angles of the triangle are less than right angles) or it could be an obtuse triangle (one of the three angles is greater than a right angle).

What is cosine law state?

Definition of law of cosines



1 : a law in trigonometry: the square of a side of a plane triangle equals the sum of the squares of the remaining sides minus twice the product of those sides and the cosine of the angle between them.

What does SSS mean in geometry?

key idea

What is sine and cosine law?

The sine rule is used when we are given either a) two angles and one side, or b) two sides and a non-included angle. The cosine rule is used when we are given either a) three sides or b) two sides and the included angle.

What is cosine rule used for?

The cosine rule (or the law of cosines) is a formula which can be used to calculate the missing sides of a triangle or to find a missing angle. To do this we need to know the two arrangements of the formula and what each variable represents.

Do all triangles equal 180?

The angle sum of a triangle will always be equal to 180°. The angle sum of a quadrilateral is equal to 360°, and a triangle can be created by slicing a quadrilateral in half from corner to corner. Since a triangle is essentially half of a quadrilateral, its angle measures should be half as well. Half of 360° is 180°.