Thursday

April 24, 2014

April 24, 2014

Posted by **joe** on Thursday, December 8, 2011 at 10:41pm.

in triangle YZX x=12cm z=16cm measure of angle Y= 130 degrees

in trianglE XYZ z= 11in. x= 7in. y= 13in.

- geometry -
**drwls**, Friday, December 9, 2011 at 7:12amUse this formula, which is attributed to Heron of Alexandria but can be traced back to Archimedes.

Area = sqrt[s(s-a)(s-b)(s-c)],

where s=(a+b+c)/2 or perimeter/2.

- help me please -
**Steve**, Friday, December 9, 2011 at 11:21amTo use that formula on the first triangle, you need to figure the length of side y

Draw the altitude h from Y to XZ, meeting XZ at P

Let angle a = <XYP

h/16 = cos a

h/12 = cos(130-a)

16cos z = 12cos(130-a)

a = 68.81°

So, side y = XZ = 16sin68.81° + 12sin61.19° = 25.432

Now you can use Heron's formula to find the area: 73.54

**Related Questions**

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

algebra/math - I have this figure of a square QRST with an equilateral triangle ...

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

GEOMETRY - Here are the figures. file:///C:/Users/ALIZAJOY/Pictures/Untitled....

geometry - Open that link please please help me with my assignments 1. in the ...

Pre-Algebra - A triangle is enlarged by a scale factor of 10/3. a) If the ...

math - Area of a Triangle. The area in square meters of a triangle is given by A...

Math-geometry - . If a spherical Triangle on Earth has an excess of 30 degrees, ...

GEOMETRY URGENT PLEASE - (imageshack)(.)us(/)photo (/) my-images (/)42(/)2vja. ...

Geometry - a. If a spherical Triangle on Earth has an excess of 30 degrees, find...