# The area of triangle whose adjacent sides are is :a)√70/2 sq. unitsb)9√2 /2 sq. unitsc)3√3 /2 sq. unitsd)2√3 /2 sq. unitsCorrect answer is option 'A'. Can you explain this answer? Related Test: Test: Cross Product

## JEE Question Shivani Jun 12, 2018 Suresh Kumar May 13, 2020  Vikas Singh Nov 17, 2020
A cross B by 2 is the answer will give the area of triangle because A cross B gives area of parallelogram and in parallelogram it is divided into 2 equal parts so divide the area of parallelogram by 2 gives the area of triangle Aishwary Omar Apr 21, 2020  Asiya Anjum Jun 01, 2020
￼Asiya anjum Nisarga P7 4 days ago  Shashmith Shashmith Mar 24, 2020
Area = 1/2 × | a × b | = √70/2 Navya Hegde Apr 09, 2020
Hence option A is the correct one Uppuluri Sv Subbarao May 02, 2020  Mohit Mittal Jul 01, 2020
Area = 1/2 ( cross product of both vectors of adjacent side ) Gurram Samanidhar Reddy Mar 28, 2020  Ankurkumar Ankurkumar Apr 23, 2020  Srija Rachakonda May 29, 2020  Mani Chari May 28, 2020  Md Altamash Alam Apr 15, 2020  Shaurya Sawai Sep 16, 2020  Shubham Karande Aug 29, 2018
Do the cross product. You will get the area of parallelogram and then divide it by 2, you will get the area of triangle Shweta Bhamu May 28, 2020
Area of triangle =1/2×modulous (axb) wher 'a' and 'b' adjacents side vecto of triangle. Shreya Singh Sep 16, 2018
Area of triangle is =1/2|ab|.
on doing ab cross product =|6i^-5j^+3k^|=√36+25+9=√70...
area of triangle=1/2(√70).
=√70/2.... Aman Kumar Jul 21, 2020
Correct option a Aman Choudhary Jul 21, 2020
A hoga Hareesh Kumar Jul 12, 2020
A Sudesh Kumar Jun 07, 2020
Cross multiply the two vectors by matrices or by other methods and then divide by 2 Gayatri Devi Aug 19, 2020
You will easily get the answer by the standard cross product formulae :(|a×b|)/2.sqrt70/2 is the answer. Krit Goswami Jul 01, 2020