The interior angle sum of triangles and finding the missing angle in a triangle.

               Find the missing angles in triangles.

I will be teaching you today about finding the missing angle in triangle.

First of all you need to know that the sum of the angles in a triangle always add up to 180 degrees.

Most of the time they represent the missing number with with a letter such as x.

Bh represent base and height of a triangle.

First of all you add up the all ready given angles of the triangle then find the sum that's missing will be the angle.

Multiplying Numerators and Denominators

           Multiplying Numerators & Denominators.

Here is an example: 6/7  x  14/18 = 2/3 

Now I will show you how to work it out.

So find out if 6 & 18 have any of the same multiples. 

Well hopefully you found out that they both have a multiple of 6. Now you have to find out how many 6's go into 6 and 18. So then cross out 6 and 18 and you should be putting a 1 and 3 where the 6 and 18 used to be. 

Now do the same on the other side with the 14 and the 7.

So your equation should look like this: 





Now that you know what the equation should look like, all you have to do is multiply the 1 and 2 which is 2, then 1 and 3 which equals 3.


So the answer is 2/3

Now I will show u some more examples.

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