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Q.

If https://lh4.googleusercontent.com/IBHHIqRfU7QZ5FHpmbiQcPpWQc4VvD-gd1hg1GIQVzxeC4qyXbeQHD4CAtXrb0GMRGdvdskPchGszCZxccyQnCrLNtGj2lWuTlSV-uPVJmeJIpyBesTiSoIZO9CZYaRgBL_B40KSrWlO9LB2rM-M-Ain each https://lh4.googleusercontent.com/EeSdptg_K-WfHSz5vJ4w8CgFnIcZnO1otNAZKX_xzQujdfX9x65UHxwAnoK5hSrmJHBNdN3yXLQYfDPxBuw58v4AiRkGBmEG5QtyPDLPC4btYmj3N2Aw9WeR2F1UvIkKrDvi8WnBwERWl6anV9gc0w, the triangle is 


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a

equilateral triangle 

b

isosceles triangle 

c

unequal triangle 

d

right triangle 

answer is B.

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Detailed Solution

Concept:
Here, we  use the "law of cosines" to find the values ​​of https://lh5.googleusercontent.com/3cJKDB4AFPWF9dX12X-FiwTMRFzpS68tI3syB6N73MY7r5stgoWdG2aZ3bmkwuOMYQDb4xYvT3Fhcgn5GLC1b__aYxcFicztGMlorkzYXyV5JocstoUxstsjCqy9AaPKPhlsYnjwHQUG0W4F1-Wn9A and https://lh5.googleusercontent.com/V2ZF_z0TfhZxXx6OMi34eV0U1tROxoxmTFC0kObvMo-JGbH8Jv1gJ4L-we2BUMxbXPIykg6dE4jQVYWhGFzI5rhcLa66Z6g4Zfm6b37oNoZolmoURrdOnN45iPpETMPO3XdNVM7Cq7D1SO7rp8mMnA from the theorem and assign them to the above question. The law of cosines uses this theorem because it associates all three sides of a triangle with the angle of the triangle. The description shows a combination of sides and angles. Therefore, it is easy to prove a given statement using this law.
Using Cosine formula,
https://lh6.googleusercontent.com/fosQELY5TUHtFABss03NJcdmYyDFDyTksB4aDJpgmnQnXPahaGpleVC4pElqnHULxuWNocxlUf924VjuSO1MTA7jho6vAU5sc36bFz9cy2SM3fqRma2WA8ZT9cN-W24TOeX9-hv6YwVtBLf0gjwbzghttps://lh4.googleusercontent.com/9tfkfH_9nOZTuTZecpUgCpqNRz4hutzLC48kRiMdczP3lC56ift8gaL1BalT7HLdoqP5PZsTONEZp0z3NDs2ZPq3GmCE0Plxmn_5UsSfg3Vs9uNE-yNfiJBuax3TKgsmyNU9qQila8X4AD-lBYZY8Ahttps://lh4.googleusercontent.com/ye6aTvCqY6y63NlrSofWs5l6vZLMiGCtXEmuti8aAglHtqPsu39f-eme3lPnuckVRkY4e9laJhS9aPUCv8X7gYRTw_nkTLp7XsZ0v4ORghe4mvdG-HOvEQGdnwPnCMJCpkYivIKE1L-sv1empugHfwhttps://lh3.googleusercontent.com/kIjljX_s2D-1QGv7sVut7stMHLVw7rSViFuHjveq6MzXuJ5KlZKDugc1BhOhO_QmxL5xk9lxTJnKpEaPjfFE0oQA_5hYSH0cDNT0b_1HsqIbPPN2e9l8f0SfsP7RSLnRbeqiOxNNwfi_AsytFMo4dghttps://lh6.googleusercontent.com/1DAJ42jjcy14QKbwxaq3Jbbcb-r9cgMKXNd79xpzgUjW9s3pvWlp0_O3JWfBiWm0MMUugoqMGQ_ckcXjGXXEWfjpbvlz_9_1m5uHlaLXNdmoVENvTlCNsN1WqSkitbYhVXdGskDgK0gQ3z8uccKgcwhttps://lh5.googleusercontent.com/oagZp_TGinE17wfMHljRa5WErbzDj-JOrfZ20gJ4cuPAmfQKlzHbXuCAThvhj0QLERFjQTZiPXM2lxG8jDOYsUGI002npekferwierGxKto05L_FVRMXr4dUMFyXThGKfzDQSnvWFmOsQfmKpkJeOghttps://lh6.googleusercontent.com/InVDyGI7URQhCs6q8hKpc5dcjk2yyBjf7htqgD9x9etk7SYHHxP5HieQvDKr8T2Dm58fNxR-qcoTKs3Cp4rEE6T-GHW5QRZOszI_EsmsK56bZoGXNU1cJ-sP1n7FtVBjxqOLPnnC_emhpmWlkMTNqwTwo sides of https://lh4.googleusercontent.com/8slZxEjSHSXsADyYPFV9_OBv4zvaSER1-rNi90LMbKASg_9oswpQDFKA1IQcWsQ52W4CcsexgfdHlGz49-PNmgM5WksKeGBukN7peisqlqQR_B8aUDsh7cI1FevjWahs2urvy8qJ3xzhn_7REu5eeg are equal
So, triangle is isosceles triangle Hence, the correct option is 2) isosceles triangle
 
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If in each , the triangle is