Wednesday

April 16, 2014

April 16, 2014

Posted by **aneesha** on Sunday, February 6, 2011 at 9:55am.

- math -
**dave**, Sunday, February 6, 2011 at 10:05amcheck out law of cosines

- math -
**helper**, Sunday, February 6, 2011 at 10:56amTriangle ABC

AB = x

BC = x - 4

AC = 10

angle BAC = 60 deg

Using Law of Cosines

a^2 = b^2 + c^2 - 2bc cos A

(x -4)^2 = 10^2 + x^2 - 2(10)(x)cos 60

x^2 - 8x + 16 = 100 + x^2 - 20x (0.5)

x^2 - 8x + 16 = 100 + x^2 - 10x

2x = 84

x = 42

**Related Questions**

maths - In a triangle ABC, AB = 2 cm, BC = 3 cm and AC = 4 cm. Choose the two ...

math - AB = 8 cm, AC = 6 cm, AD = 7 cm, CD = 2.82 and CAB=50°. Find the length ...

geometry - In triangle ABC, • AB is x cm long • BC is twice the length of AB • ...

math - AB = 8 cm, AC = 6 cm, AD = 7 cm, CD = 2.82 and CAB=50° (a) the length BC...

math - in the triangle ABC , AD ray bisects the exterior angle of the triangle ...

Math - Triangle ABC is similar to triangle APQ, with angle CBA equal to angle ...

math - AB = 8 cm, AC = 6 cm, AD = 7 cm, CD = 2.82 and CAB=50°. Calculate to 2 ...

trig - AB = 8 cm, AC = 6 cm, AD = 7 cm, CD = 2.82 and CAB=50° (a) the length BC...

Geometry - If in given triangle ABC, AB = 8 cm and BC = 6 cm, then what is the ...

Geometry..... reposted ques by me - in the diagram AB=20 cm, BC=21 cm, AD=10 cm ...