# Triangles Ii

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Category: Education

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### Triangles I:

Triangles I By. Ruhil

### Definition:

Copyright © 2000 by Monica Yuskaitis Definition Polygon – a closed many straight-sided figure.

### Definition:

Copyright © 2000 by Monica Yuskaitis Definition Angle – two rays that meet at a common end point.

### Definition:

Copyright © 2000 by Monica Yuskaitis Definition Degree – a unit of measurement of an angle or arc, represented by the symbol º. 30 º

### Definition:

Copyright © 2000 by Monica Yuskaitis Definition Triangle – a polygon with 3 angles and 3 straight sides.

### Property of triangles:

Copyright © 2000 by Monica Yuskaitis Property of triangles The sum of all the angles equals 180º degrees . 90 º 30 º 60 º

### Property of triangles:

Copyright © 2000 by Monica Yuskaitis Property of triangles The sum of all the angles equals 180º degrees . 90 º 30 º 60 º 60 º 90 º 30 º + 180 º

### Property of triangles:

Copyright © 2000 by Monica Yuskaitis Property of triangles The sum of all the angles equals 180º degrees . 90 º 50 º 40 º 40 º 90 º 50 º + 180 º

### Property of triangles:

Copyright © 2000 by Monica Yuskaitis Property of triangles The sum of all the angles equals 180º degrees . 60 º 60 º 60 º + 180 º 60 º 60 º 60 º

### What is the missing angle?:

Copyright © 2000 by Monica Yuskaitis What is the missing angle? 70 º 70 º ? + 180 º 70 º 70 º ?

### What is the missing angle?:

Copyright © 2000 by Monica Yuskaitis What is the missing angle? 90 º 30 º ? + 180 º 30 º 90 º ?

### What is the missing angle?:

Copyright © 2000 by Monica Yuskaitis What is the missing angle? 60 º 60 º ? + 180 º 60 º 60 º ?

### What is the missing angle?:

Copyright © 2000 by Monica Yuskaitis What is the missing angle? 30 º 78 º ? + 180 º 78 º 30 º ?

### What is the missing angle?:

Copyright © 2000 by Monica Yuskaitis What is the missing angle? 40 º 40 º ? + 180 º 40 º 40 º ?