## How many straight lines are needed to draw a triangle?

Each of the straight lines we used now act as a part of the figure. We will call each straight line a side of the figure. So, this figure has three sides and is called a triangle. When we say “triangle” we are either referring to how to arrange the three lines or the enclosing space.

## How do you make 9 triangles out of M?

Cut the letter M to obtain 9 single triangles by drawing 3 straight lines. A single triangle is a triangle such that there is no other triangle inside it.

## How many matchsticks will there be in the 7th picture?

Answer: If you look closely, the middle match stick is not the reflection in the mirror, there is one, matchstick behind the lighter. One has to count them. So in total, there are eight matches.

## What are the 7 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.

## How many types of triangles are there in class 9?

According to the lengths of their sides, triangles can be classified into three types which are: Scalene. Isosceles. Equilateral.

## What is used in matchbox?

The head of safety matches are made of an oxidizing agent such as potassium chlorate, mixed with sulfur, fillers and glass powder. The side of the box contains red phosphorus, binder and powdered glass.

## How do you denote a triangle?

A triangle has three sides, three vertices, and three angles. The sum of the three interior angles of a triangle is always 180°. The sum of the length of two sides of a triangle is always greater than the length of the third side. A triangle with vertices P, Q, and R is denoted as △PQR.

## What is a triangle in maths Chapter 7?

NCERT Solutions for Class 9 Maths Chapter 7 Triangles provides the answers and questions related to the chapter. Triangle, the word itself describes its meaning. “Tri” means “three” so a closed figure formed by three intersecting lines is known as a Triangle.

## What is the meaning of Tri triangle?

Triangle, the word itself describes its meaning. “Tri” means “three” so a closed figure formed by three intersecting lines is known as a Triangle. Students must have already studied the angle sum property of a triangle in Chapter 6 of NCERT Class 9 Maths.

## How do you prove that a triangle bisects AB?

Triangles ΔAOD and ΔBOC are similar by AAS congruency since: ∴ ΔAOD ΔBOC. So, AO = OB (by the rule of CPCT). Thus, CD bisects AB (Hence proved). 4. l and m are two parallel lines intersected by another pair of parallel lines p and q (see Fig. 7.19).

## How many interior angles does a triangle have?

So, a triangle has three interior angles. Use a straightedge to draw a large triangle on a sheet of paper and cut it out. Tear off the three corners and rearrange the angles so their sides are adjacent and their vertices meet at a point.