Mathematics - Properties of Triangle Question with Solution | TestHub

MathematicsProperties of TriangleGeneral (basic formula based)Medium2 minQB

MathematicsMediumsingle choice

If a:b:c=7:8:9, find cos A:cos B.

Answer:

Solution:

cos A=( $8^{2}$ + $9^{2}$ - $7^{2}$ )/(2·8·9)=2/3; cos B=( $7^{2}$ + $9^{2}$ - $8^{2}$ )/(2·7·9)=11/21. Thus cos A/cos B=14/11, not listed.

Stream:JEESubject:MathematicsTopic:Properties of TriangleSubtopic:General (basic formula based)

⏱ 2mℹ️ Source: QB

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