The ratio of three angle are 3:4:5

what is the highest angle of the triangle?

The sum of the sides of a triangle is equal to 180º.

The three angles will be: 3x, 4x and 5x.

we can suggest the following equation:

3x+4x+5x=180

12x=180

x=180/12

x=15

The angles would be:

3x=3 (15) = 45

4x=4 (15) = 60

5x=5 (15) = 75

Answer: the highest angle would measure 75º.