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To determine the size of the angle marked \( t \), we can use the fact that the sum of angles on a straight line is \( 180^\circ \).

Given:
- The angle adjacent to \( t \) is \( 60^\circ \).

The equation for the sum of the angles is:
\[ t + 60^\circ = 180^\circ \]

Solving for \( t \):
\[ t = 180^\circ - 60^\circ \]
\[ t = 120^\circ \]

Therefore, the size of the angle marked \( t \) is \( 120^\circ \).

Would you like any further details or have any questions?

Here are some additional questions you might find interesting:
1. How do you calculate the complementary angle of a given angle?
2. What is the definition of supplementary angles?
3. How do you find the angle in a triangle given two angles?
4. Can you explain how to use the exterior angle theorem in triangles?
5. What are vertically opposite angles and how do they relate?

**Tip:** Always remember that the sum of angles on a straight line is \( 180^\circ \), and this property is often used to solve problems involving adjacent angles.

Learn how to find the size of the angle marked t using the angle sum property of a straight line. In this example, the adjacent angle is given as 60°, and we solve for t by setting up and solving a linear equation. Suitable for students in Grades 7-9.

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