ISOSCELES TRIANGLE
Definition Of Isosceles Triangle
When the two sides of a triangle are equal, then the triangle is called as an Isosceles Triangle.
More About Isosceles Triangle
The diagonals of an Isosceles Triangle are equal.
In an isosceles triangle, the two angles are equal.
Video Examples: Trapezoids : Isosceles Triangle
Example of Isosceles Triangle
â–³ABC is an isosceles triangle as sides AB and AC are equal and also ∠ABC and ∠BCA are equal.
Solved Example on Isosceles Triangle
Ques: Which of the following is an isosceles triangle?
Choices:
A. Figure 2
B. Figure 4
C. Figure 1
D. Figure 3
Correct Answer: D
Solution:
Step 1: A triangle with two equal sides is known as an isosceles triangle.
Step 2: Among the figures shown, the figure 3 has two equal sides.
Step 3: Therefore, figure 3 is an isosceles triangle.
Quick Summary
- Two sides are equal in length.
- The two angles opposite the equal sides are also equal.
🍎 Teacher Insights
Use visual aids and hands-on activities to demonstrate the properties of isosceles triangles.🎓 Prerequisites
- Triangle
- Sides
- Angles
Check Your Knowledge
Q1: Which of the following triangles is isosceles?
Q2: An isosceles triangle has angles of 70 and 40 degrees. What is the measure of the 3rd angle?
Frequently Asked Questions
Q: Are equilateral triangles also isosceles?
A: Yes, because they have at least two sides of equal length.
Q: Can a right triangle be isosceles?
A: Yes, it can have a 90-degree angle and two equal sides.