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The image shows a geometric problem involving a semicircle and triangles. Let's analyze the content and answer the questions.

### Problem Analysis:

1. **問1:** What type of triangle is △OAB?
2. **問2:** What is the measure of the central angle labeled ⑦?

### Solution:

1. **問1 (Type of △OAB):**
   - The figure shows a semicircle with diameter \( OB \). Triangle \( OAB \) is inscribed in the semicircle with \( OB \) as its hypotenuse.
   - By the Inscribed Angle Theorem, any triangle inscribed in a semicircle with the diameter as one side is a right triangle. 
   - Therefore, △OAB is a **right triangle** with a right angle at point \( A \).

2. **問2 (Measure of the central angle labeled ⑦):**
   - Central angle ⑦ is subtended by arc \( AB \) of the semicircle. In a semicircle, the central angle that subtends the entire diameter is always \( 180^\circ \). However, since this question specifically refers to angle ⑦, which likely subtends only a segment of the semicircle:
   - The measure of angle ⑦ depends on the specific configuration shown. Without precise measurements, it's challenging to provide an exact degree, but the information suggests it is proportional to the arc's length that angle ⑦ subtends.

Would you like more details on the central angle calculation, or do you have any other questions?

### Related Questions:
1. How do you determine the type of a triangle inscribed in a semicircle?
2. What is the Inscribed Angle Theorem, and how does it apply to triangles in a semicircle?
3. How do you calculate central angles in circles when given arcs?
4. What properties do right triangles have when inscribed in semicircles?
5. Can the measure of angle ⑦ be determined exactly without additional data?

**Tip:** Always remember that a triangle with one side as the diameter of a semicircle is a right triangle, a key property of semicircle inscribed figures.

The image shows a geometric problem involving a semicircle and triangles. The questions are: 1) What type of triangle is △OAB? 2) What is the measure of the central angle labeled ⑦?

Learn how to solve a geometry problem involving a right triangle inscribed in a semicircle and the calculation of a central angle. The solution covers the inscribed angle theorem and properties of triangles within semicircles. Suitable for students in Grades 8-10.

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