Friday

April 18, 2014

April 18, 2014

Posted by **Shane** on Monday, April 29, 2013 at 3:14pm.

- Maths -
**Henry**, Tuesday, April 30, 2013 at 4:21pmUse the law of cosines.

cosA = (-a^2+b^2+c^2)/2bc.

cosA=(-(8.6)^2+(9.1)^2+(9.7)^2)/176.54 =

0.58310.

A = 54.33o.

Area = 0.5*bc*sinA.

Area=0.5*9.1*9.7*sin(54.33) = 35.9 cm^2

**Related Questions**

5th grade - For each right triangle, draw the rectangle made by drawing sides ...

geometry triangle - 1. can you tell me how to find the area of an equilateral ...

Maths - 2equal sides of triangle r4m less than 3times the third side find the ...

maths - 2 equal sides of a triangle are 4m less than 3 times the third side find...

Math...Geometry - Hello, Can someone please tell me if I worked this out correct...

Geometry - Given: X, Y, and Z are the midpoints of teh sides of triangle ABC. ...

Calculus - An isosceles triangle is to be drawn with its two equal sides of ...

math URGENT!!!! - the midpoints of the sides of a triangle are (1,1),(4,3),and (...

geometry - 14. Question says that there is a triangle with a base of x units and...

Geometry - Find the area of each equilateral triangle. The triangle has 12cm ...