Check sibling questions

Ex 6.5, 2 - Chapter 6 Class 7 Triangle and its Properties

Last updated at March 23, 2023 by

Ex 6.5, 2 - ABC is a triangle, right-angled at C. If AB = 25 cm and AC

Ex 6.5, 2 - Chapter 6 Class 7 Triangle and its Properties - Part 2

Get live Maths 1-on-1 Classs - Class 6 to 12

Book 30 minute class for β‚Ή 499 β‚Ή 299

Transcript

Ex 6.5, 2 ABC is a triangle, right-angled at C. If AB = 25 cm and AC = 7 cm, find BC.In βˆ†ABC, right angled at C, AB = 24 cm, AC = 7 cm, BC = ? By Pythagoras theorem, 〖𝐴𝐡〗^2 = 〖𝐴𝐢〗^2 + 〖𝐡𝐢〗^2 γ€–(25)γ€—^2 = γ€–(7)γ€—^2 + 〖𝐡𝐢〗^2 625 = 49 + 〖𝐡𝐢〗^2 625 βˆ’ 49 = 〖𝐡𝐢〗^2 576 = 〖𝐡𝐢〗^2 γ€–(24)γ€—^2 = 〖𝐡𝐢〗^2 Cancelling squares 24 = 𝐡𝐢 𝐡𝐢 = 24 ∴ 𝑩π‘ͺ = 24 cm Rough 576 = 2 Γ— 2 Γ— 2 Γ— 2 Γ— 2 Γ— 2 Γ— 3 Γ— 3 = (2 Γ— 2 Γ— 2 Γ— 3) Γ— (2 Γ— 2 Γ— 2 Γ— 3) = 24 Γ— 24 = 242

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.