Equilateral Triangle

Q.

Write the name of triangle, whose all three sides are unequal in length.

Q.

In $△ABC$, $AB=AC$ and $\angle B={40}^{\circ }$. What is the value of $\angle C$?​​​​​​​

1. 6m, equilateral triangle

2. 6 m, Isosceles triangle

3. 4 m, equilateral triangle

4. 4 m, Isosceles triangle

Q.

State True or False: Every equilateral triangle is an isosceles triangle.

1. True
2. False

Q.

Question 15
In the given figure, $\angle BAC$=${90}^{\circ }$ and AD $\perp$ BC.

The number of right-angled triangles in the figure is

a) 1
b) 2
c) 3
d) 4

Q. The angles of a right angled triangle are

1. acute, right, right.
2. right, obtuse, acute.
3. acute, acute, obtuse.
4. acute, acute, right.

Q. From the figure identify the type of triangle:

1. equilateral triangle
2. scalene triangle.
3. isosceles triangle.
4. obtuse angled triangle.

Q. A triangle whose all sides are equal is called

(a) an equilateral triangle
(b) an acute triangle
(c) a right triangle
(d) an isosceles triangle

Q.

A triangle is said to be$\_\_\_\_\_\_$ if each one of its sides has the same length. [equilateral/isosceles]

Q. How many lines does an equilateral triangle have and how many lines does an isosceles triangle have?

Q.

Consider the two statements:

Statement 1: The points A, B, and C will lie on a straight line if $\angle ABD$ + $\angle CBD$ = ${180}^{\circ }$.

Statement 2: The angle on a straight line is ${180}^{\circ }$.

1. Both the statements are true and statement 2 is not the correct explanation of statement 1

2. Statement 1 is false and statement 2

3. Both the statements are true and statement 2 is the correct explanation of statement 1

4. Statement 1 is true and Statement 2 is false

Q. Classify the following triangles according to side:

Q.

State which of the following statements are true and which are false :

Every equilateral triangle is an isosceles triangle

1. True
2. False

Q.

In an equilateral triangle all sides are equal.

1. False

2. True

Q. Name the following types of triangles:
a)Triangle with length 9m, 9m, 9m
b)Triangle with length 6m, 6m, 9m
c)Triangle with angles 90${}^{\circ }$, 40${}^{\circ }$, 50${}^{\circ }$
d)Triangle with angles 70${}^{\circ }$, 70${}^{\circ }$, 40${}^{\circ }$
[4 MARKS]

Q.

Classify the triangle (Scalene, isosceles, equilateral)

• $△ABC,\angle B=90°$

Q. Which of the following is possible for triangle ABC?(in degrees)

1. Angle C=120
2. Angle B=110
3. Angle A=130
4. Angle C=150

Q. An/A has all the sides equal.

1. equilateral triangle
2. isosceles triangle
3. scalene triangle

Q.

Question 2

Match the following
$\begin{array}{cc}MeasureofTriangle& Typesoftriangle\\ 3sidesofequallength& Scalene\\ 2sidesofequallength& Isoscelesrightangle\\ Allsidesareofdifferentlength& Obtuseangle\\ 3acuteangles& Rightangle\\ 1rightangle& Equilateral\\ 1obtuseangle& Acuteangle\\ 1rightanglewithtwosidesofequalLength& Isosceles\end{array}$

Q.

Statement 1: All the angles of an equilateral triangle will always be equal.
Statement 2: Every angle of an equilateral triangle is ${60}^{\circ }$

1. Statement 1 is false but Statement 2 is true.

2. Statement 1 is true but Statement 2 is false.

3. Statement 1 is false and Statement 2 is also false.

4. Statement 1 is true and Statement 2 is also true.

Q.

This triangle has exactly two equal sides.

1. Scalene triangle

2. Isosceles Triangle

3. Equilateral Triangle.

4. Acute Triangle

Q. Explain the three types of triangles based on sides. [2 MARKS]

Q. Consider the following equilateral triangle:

What is the measure of $\angle CAB$ ?

1. ${60}^{\circ }$
2. ${180}^{\circ }$
3. ${90}^{\circ }$
4. ${160}^{\circ }$

Q.

Name the triangle you can see in the figure -

Q. A triangle whose all sides are equal is called

(a) an equilateral triangle
(b) an acute triangle
(c) a right triangle
(d) an isosceles triangle

Q. A triangle whose all the sides are equal is called an _________.

1. Isosceles
2. equilateral
3. Scalene
4. None of these

Q.

State which of the following statements are true and which are false :

If all the three sides of a triangle are equal, it is called a scalene triangle.

1. True
2. False