The image you uploaded contains two geometric diagrams related to circles and triangles. Here's a brief breakdown of each:

1. Left Diagram (c):

   • There's a circle with a central point labeled "O."
   • Two sides of a triangle (with sides labeled "a" and "b") extend from the center of the circle.
   • An angle of $106^\circ$ is marked between the two sides labeled "a" and "b."

2. Right Diagram (d):

   • A circle with a triangle inscribed within it.
   • The two sides of the triangle are labeled "a."
   • The angle at one vertex of the triangle is $70^\circ$.

These diagrams seem to involve circle geometry, possibly touching on inscribed angles, central angles, or properties of triangles inscribed in circles.

Would you like to analyze these diagrams further, or do you have specific questions related to them?

Here are some related questions you could explore:

1. How do you calculate the interior angle of a triangle inscribed in a circle?
2. What is the relationship between central angles and inscribed angles in a circle?
3. How can we prove that opposite angles in an inscribed quadrilateral sum to 180°?
4. What is the formula for the area of an equilateral triangle inscribed in a circle?
5. How do you determine the length of a side of a triangle inscribed in a circle?

Tip: In circle geometry, the angle subtended by a chord at the center of the circle is twice the angle subtended at the circumference on the same side of the chord.