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In DeltaABC if r(1)=2r(1)=3r(3) and D is...

In `DeltaABC` if `r_(1)=2r_(1)=3r_(3)` and D is the mid point of BC then `cos angle ADC=`

A

`7//25`

B

`24//25`

C

`-7//25`

D

`-24//25`

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-PROPERTIES OF TRIANGLES-LECTURE SHEET EXERCISE - III (Straight Objective Type Question)
  1. The legs of a right triangle are a and b the linc segment of length d ...

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  2. The length of medians of a Delta^("le") ABC are 6, 8 , 10 then its ar...

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  3. In DeltaABC if r(1)=2r(1)=3r(3) and D is the mid point of BC then cos ...

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  4. In DeltaABC, if a=7 b=8, c=9 then the distance from the vertex B to th...

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  5. In triangle ABC, medians AD and CE are drawn. If AD = 5, angle DAC = p...

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  6. If the median of DeltaABC through A is perpendicular to AB then tan A+...

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  7. Let l(1), l(2), l(3) be the lengths of the internal bisectors of angle...

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  8. In trianle ABC, CD is the bisector of the angle C. if cos . C/2 = 1/3 ...

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  9. If AD, BE , CF are internal bisectors of the angles of Delta ABC, " th...

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  10. If two shorter sides of a triangle measure 9 and 18. If the internal a...

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  11. The internal angular bisectors of angles of a Delta^("le") ABC meets c...

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  12. In a triangle ABC bisector of lfloor C meets the side AB at D and circ...

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  13. In Delta ABC , the median AD divides angle BAC such that angle BAD : ...

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  14. In a triangle ABC, the median to the side BC is of length 1/sqrt(11 - ...

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  15. If AD, BE and CF are the medians of a triangle ABC, then AD^(2) + BE^(...

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  16. If in a triangle PQR , sin P, sin Q, sin R are in A.P., then

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  17. In DeltaABC, AD is the altitude from A, if b gt c, C=23^(0), AD=(abc)/...

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  18. Altitude AD of an equilateral triangle ABC is a diameter of circle. If...

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  19. A triangle is inscribed in a circle. The vertices of the triangle divi...

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  20. The base of a triangle is a and ratio of remaining two sides is r ( r ...

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