1. Triangle is divided into (equilateral triangle), (isosceles triangle) and (equilateral triangle) according to its sides.

2. In a right triangle, one of the larger acute angles is five times that of the other acute angle. What are the two acute angles?

Solution: (180-90) ÷ 6 = 15 degrees.

15× 5 = 75 degrees

A: The big one is 75 degrees, and the small one is 15 degrees.