Question

1. estimate to measure the angle.

Explanation:

Step1: Recall angle - type knowledge

An acute angle is less than 90 degrees. This angle appears to be less than 90 degrees.

Step2: Make an estimate

By comparing with common - known angles like 30, 45, 60, 90 degrees, we can estimate this angle to be around 45 degrees.

Answer:

Approximately 45 degrees