In ΔABC, AB = 8 cm. ∠A is bisected internally to intersect BC at D. BD = 6 cm and DC = 7.5 cm. What is the length of CA?

This question was previously asked in
RRB ALP Previous Paper 5 (Held On: 10 Aug 2018 Shift 3)
View all RRB ALP Papers >
  1. 12 cm
  2. 12.5 cm
  3. 10.5 cm
  4. 10 cm

Answer (Detailed Solution Below)

Option 4 : 10 cm
Free
General Science for All Railway Exams Mock Test
20 Qs. 20 Marks 15 Mins

Detailed Solution

Download Solution PDF

Given:

In ΔABC, AB = 8cm

∠A bisected internally to intersect BC at D.

AB = 8 cm, BD = 6 cm and DC = 7.5 cm

Concept used:

In a triangle, the angle bisector of an angle is divides the opposite side to the angle in the ratio of the remaining two sides.

Calculation:

AB = 8 cm, ∠A is bisected internally to intersect BC at D,

⇒ AB/AC = BD/CD

⇒ 8/AC = 6/7.5

∴ AC = 10 cm

Latest RRB ALP Updates

Last updated on Jul 21, 2025

-> The Railway Recruitment Board has scheduled the RRB ALP Computer-based exam for 15th July 2025. Candidates can check out the Exam schedule PDF in the article.

-> RRB has also postponed the examination of the RRB ALP CBAT Exam of Ranchi (Venue Code 33998 – iCube Digital Zone, Ranchi) due to some technical issues.

-> SSC Selection Post Phase 13 Admit Card 2025 has been released @ssc.gov.in

-> UGC NET June 2025 Result Out at ugcnet.nta.ac.in

-> There are total number of 45449 Applications received for RRB Ranchi against CEN No. 01/2024 (ALP).

-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.

-> The official RRB ALP Recruitment 2025 provides an overview of the vacancy, exam date, selection process, eligibility criteria and many more.

->The candidates must have passed 10th with ITI or Diploma to be eligible for this post. 

->The RRB Assistant Loco Pilot selection process comprises CBT I, CBT II, Computer Based Aptitude Test (CBAT), Document Verification, and Medical Examination.

-> This year, lakhs of aspiring candidates will take part in the recruitment process for this opportunity in Indian Railways. 

-> Serious aspirants should prepare for the exam with RRB ALP Previous Year Papers.

-> Attempt RRB ALP GK & Reasoning Free Mock Tests and RRB ALP Current Affairs Free Mock Tests here

-> Bihar Police Driver Vacancy 2025 has been released @csbc.bihar.gov.in.

->UGC NET Final Asnwer Key 2025 June has been released by NTA on its official site

More Triangles, Congruence and Similarity Questions

Hot Links: teen patti bindaas teen patti neta teen patti joy 51 bonus teen patti - 3patti cards game downloadable content