Question

Good Evening Everyone

English Activity Will be conducted on -- ENVIRONMENTAL PROTECTION --- on the occasion of WORLD ENVIRONMENT DAY--Tomorrow e. i. JUNE 5 , 2021

Sources for Informations--- BOOKS
INTERNET
Prepare for tomorrow's activity with keen interest and give the best presentation. ​

Answer 1

Answer:

3

Example 2.2 If the vertices of a triangle ABC are (1, 8, 4), (4, 5, - 2) and (2, -3, 1)

respectively, find the angles of the triangle.