Subscribe to our YouTube channel for the latest videos, updates, and tips.


Equilateral Triangle Inscribed

We will prove that, PQR is an equilateral triangle inscribed in a circle. The tangents at P, Q and R form the triangle P’Q’R’. Prove that P’Q’R’ is also an equilateral triangle.

Equilateral Triangle Inscribed

Solution:

Given:

PQR is an equilateral triangle inscribed in a circle whose centre is O. Three tangents are drawn to the circle at the points P, Q and R. They intersect pair wise at P’, Q’ and R’.

To prove: P’Q’R’ is an equilateral triangle.

Proof:

Statement

Reason

1. ∠Q’PR = ∠PQR.

∠Q’RP = ∠PQR.

1. Angle between tangent and chord is equal to the angle in the alternate segment.

2. ∠PQR = 60°

2. Each angle of the equilateral triangle PQR has the measure 60°.

3. ∠Q’PR = ∠Q’RP = 60°.

3. By statements 1 and 2.

4. ∠PQ’R = 180° – (∠Q’PR + Q’RP)

             = 180° – (60° + 60°) = 60°.

4. Sum of three angles of a triangle is 180.

5. Similarly, ∠PR’Q = 60°

                and ∠QP’R = 60°.

5. Similar reason.

6. ∆P’Q’R’ is equilateral.

6. By statements 4 and 5.





10th Grade Math

From Equilateral Triangle Inscribed to HOME PAGE




Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.



New! Comments

Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.




Share this page: What’s this?

Recent Articles

RSS

  1. 8 Times Table | Multiplication Table of 8 | Read Eight Times Table

    May 18, 25 04:33 PM

    Printable eight times table
    In 8 times table we will memorize the multiplication table. Printable multiplication table is also available for the homeschoolers. 8 × 0 = 0 8 × 1 = 8 8 × 2 = 16 8 × 3 = 24 8 × 4 = 32 8 × 5 = 40

    Read More

  2. Worksheet on Average | Word Problem on Average | Questions on Average

    May 17, 25 05:37 PM

    In worksheet on average interest we will solve 10 different types of question. Find the average of first 10 prime numbers. The average height of a family of five is 150 cm. If the heights of 4 family

    Read More

  3. How to Find the Average in Math? | What Does Average Mean? |Definition

    May 17, 25 04:04 PM

    Average 2
    Average means a number which is between the largest and the smallest number. Average can be calculated only for similar quantities and not for dissimilar quantities.

    Read More

  4. Problems Based on Average | Word Problems |Calculating Arithmetic Mean

    May 17, 25 03:47 PM

    Here we will learn to solve the three important types of word problems based on average. The questions are mainly based on average or mean, weighted average and average speed.

    Read More

  5. Rounding Decimals | How to Round a Decimal? | Rounding off Decimal

    May 16, 25 11:13 AM

    Round off to Nearest One
    Rounding decimals are frequently used in our daily life mainly for calculating the cost of the items. In mathematics rounding off decimal is a technique used to estimate or to find the approximate

    Read More