1 2

1
2

2

+
1
2
+
1
0

2

+
1
2
+
1
0

7

+
6
7

+
6
1
0

+
6

13,038

Step-by-step explanation:

Way One:

12122 + 12 + 102 + 12 + 107 + 67 + 610 + 6 = 13,038

This is a simply problem that can be solved with any standard calculator

Way Two:

You could also write it as:

12,122

     12

   102

     12

   107

    67

  610

      6

+

13,038

Way Three:

If you need to do it in your head you could break it up like this by looking for 10's and/or easy to add numbers:

(bolded means solved in next line)

12,122 + 12 + 102 + 12 + 107 + 67 + 610 + 6

12,122 + 24 + 102 + 107 + 67 + 610 + 6

12,122 + 24 + 102 + 107 + 67 + 616

Etc

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc