# What is the name of a triangle with a 90 degree angle?

The right triangle has one 90 degree angle and two

**acute**(< 90 degree) angles. Since the sum of the angles of a triangle is always**180**degrees The two sides of the triangle that are by the right angle are called the legs and the**side opposite**of the right angle is called the**hypotenuse**.A.

### What is the symbol for intersecting lines?

**Perpendicular**lines. Two lines that intersect and form right angles are called

**perpendicular**lines. The symbol ⊥ is used to

**denote perpendicular**lines. In Figure , line l ⊥ line m.

#### What does a line look like?

The rows resemble**line**segments. A**line**is a straight set of points that extend in opposite directions without ending. A ray is a part of a**line**that has one endpoint and extends in one direction without ending. A**line**segment is a part of a**line**between two endpoints.#### What is the symbol for parallel lines?

Table of symbols in geometry:Symbol Symbol Name Meaning / definition | | parallel parallel lines ≅ congruent to equivalence of geometric shapes and size ~ similarity same shapes, not same size Δ triangle triangle shape #### Are all intersecting lines are perpendicular lines?

Parallel**lines**never meet, and**perpendicular lines intersect**at a right angle. and do not**intersect**in this image, but if you imagine extending both**lines**, they will**intersect**soon. So, they are neither parallel nor**perpendicular**.

B.

### What describes a triangle?

A

**triangle is**scalene if all of its three sides are different (in which case, the three angles are also different). If two of its sides are equal, a**triangle is**called isosceles. A**triangle**with all three equal sides**is**called equilateral.#### How do you classify a triangle?

Find the value of x and then**classify**the**triangle**by its angles. The sum of the angle measures in a**triangle**is 180 degrees. The**triangle**has one obtuse angle, so it is an obtuse**triangle**. Find the value of x and then**classify**the**triangle**by its angles.#### What is the definition of acute triangle?

An**acute triangle**is a**triangle**with all three angles**acute**(less than 90°). An obtuse**triangle**is one with one obtuse angle (greater than 90°) and two**acute**angles. Since a**triangle's**angles must sum to 180°, no**triangle**can have more than one obtuse angle.#### What is an obtuse triangle?

An**obtuse triangle**is a**triangle**in which one of the angles is an**obtuse**angle. (Obviously, only a single angle in a**triangle**can be**obtuse**or it wouldn't be a**triangle**.) A**triangle**must be either**obtuse**, acute, or right.

Updated: 2nd October 2019