Question

ngle angle facts
every triangle has exactly $\boldsymbol{3}$ angles.
each angle is formed where ______ sides intersect.
each angle is opposite ______ side.
each angle is included between ______ sides.
the angles can be acute, right, or obtuse.
practice: organizing information and using visual cues
eriment with the triangle tools on pages 1 and 2.
cord the angle measures for three triangles and find their sums.

angle 1 | angle 2 | angle 3 | sum
--- | --- | --- | ---

Explanation:

1. A triangle's angle forms at the intersection of two of its sides.
2. Each angle in a triangle faces exactly one unique side opposite to it.
3. Each angle is positioned between the two sides that form it.
4. The sum of interior angles of any triangle is always $180^\circ$, so sample values are chosen to reflect this rule.

Answer:

Triangle Angle Facts

1. Every triangle has exactly $\boldsymbol{3}$ angles.
2. Each angle is formed where $\boldsymbol{2}$ sides intersect.
3. Each angle is opposite $\boldsymbol{1}$ side.
4. Each angle is included between $\boldsymbol{2}$ sides.

Practice Table (Sample Entries)

Angle 1	Angle 2	Angle 3	Sum
$90^\circ$	$45^\circ$	$45^\circ$	$180^\circ$
$100^\circ$	$50^\circ$	$30^\circ$	$180^\circ$