Angles Print Activity

Angles Print Activity

1.Use the Video Interactive to complete the following statements.

a.The 3 interior angles of a triangle always add up to .

1. Angles that make up a straight line always add up to .

c.The largest angle you can create is in any triangle in the VI.

d.The smallest angle you can create is in any triangle in the VI.

2.Determine the missing angle for each of the following triangles.

a.

b.

c.

d.

e.

f.

3.An equilateral triangle is a triangle with 3 equal angles.

1. In order to form an equilateral triangle, each interior angle must measure _____.

1. For all equilateral triangles, the following statement must be true.

so + + = 180.

c.Sketch your equilateral triangle in the space provided below.

4. An isosceles triangle is a triangle with 2 equal angles.

1. For all isosceles triangles, the following statement must be true.

An example would be + + = 180.

1. Sketch your isosceles triangle in the space provided below.

5.A scalene triangle is a triangle where all 3 angles are different.

1. For all scalene triangles, the following statement must be true.

An example would be + + = 180.

b.Sketch your scalene triangle in the space provided below.

6.Using the Video Interactive, draw a triangle with the following angles.

1. Drag down. Does become larger or smaller?

1. Drag down. What happens to A and C?

1. Drag up. Does become larger or smaller?

1. Drag up. What happens to A and C?

7.In the Video Interactive, the angles in both diagrams are denoted using 1, 2, or 3 arcs. The following example will help you answer the remaining questions. (Note: you can also use the Video Interative to model these situations)

Eg.Question:What do you observe about the arcs in a 48- 82- 50

triangle?

Answer:Each angle has a different number of arcs.

a.Question:What do you observe about the arcs in a 100- 40- 40

triangle?

Answer:

1. Question:What do you observe about the arcs in a 60- 60- 60

triangle?

Answer:

8.An acute triangle is a triangle where all 3 angles are less than .

1. For all acute triangles, the following statement must be true.

An example would be + + = 180.

b.Sketch your acute triangle in the space provided below.

9.An obtuse triangle is a triangle with one angle greater than.

1. For all obtuse triangles, the following statement must be true.

An example would be + + = 180.

b.Sketch your obtuse triangle in the space provided below.

10.A right triangle is a triangle where one angle is.

1. For all right triangles, the following statement must be true.

An example would be + + = 180.

b.Sketch your right triangle in the space provided below.

Junior High Math Interactives Page 1 of 4

2005 Alberta Education (

Shape and Space / Angles / Video Interactive / Print Activity