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To find the measure of the third angle in a triangle, we can use the fact that the sum of the interior angles of a triangle is always \(180^\circ\).

Given:
- First angle = \(88^\circ\)
- Second angle = \(21^\circ\)

Let's calculate the third angle:

\[
\text{Third angle} = 180^\circ - (88^\circ + 21^\circ) = 180^\circ - 109^\circ = 71^\circ
\]

So, the measure of the third angle is \(71^\circ\).

Would you like more details or have any questions?

Here are some related questions:
1. What is the sum of interior angles for a quadrilateral?
2. Can the third angle in a triangle be obtuse if the other two angles are both acute?
3. How do you determine if a triangle is acute, obtuse, or right based on its angles?
4. What is the measure of the third angle if two angles are both \(45^\circ\)?
5. Can the angles of a triangle be greater than \(90^\circ\)?

**Tip:** The sum of interior angles for any \(n\)-sided polygon is \((n - 2) \times 180^\circ\).

If the measures of two angles of a triangle are 88° and 21°, what is the measure of the third angle?

Calculate the measure of the third angle in a triangle if two angles measure 88° and 21°. This solution uses the angle sum property of triangles, making it ideal for students in Grades 6-8.

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