# CBSE Class 10-Mathematics: Questions and Answers Chapter –6 Triangles Part 9

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**Question 3:**

In the given figure, and , find .

**Answer:**

In

Again in ,

**Question 4:**

Determine the length of an altitude of an equilateral triangle of side .

**Answer:**

In right triangles

In right (By Pythagoras Theorem)

**Question 5:**

In the given figure, if and . Then prove that .

**Answer:**

Again

Thus, in