Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
4. Constructing Polygons
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Exercise 17 Page 387

Use a protractor to draw the given angles.

triangle with angles 70, 70, and 4 cm side
Practice makes perfect

We want to draw a triangle with a 70^(∘) angle connected to a 70^(∘) angle by a side length of 4 centimeters. First, we can use a ruler to draw a 4-centimeter side of our triangle.

To find the position of the third vertex, we can begin by drawing an angle of 70^(∘) using a protractor. Let's call the vertex of this angle A.
Angle of 70 degrees

Now we can draw the 70^(∘) angle with its vertex at the other point of the 4-centimeter side of our triangle. We can call this vertex B.

Angle of 70 degrees

The third vertex of our triangle is the point of intersection between the two rays. We can denote the vertex with C. Finally, we can draw a triangle with the given measures.

triangle with angles 70, 70, and 4 cm side