Question

If the three angles of a triangle are (2x + 15)º, (x + 20)ºand 75º. Evaluate x? explain the property used.

Answer 1

Answer:

sum of three angles of triangle is 180°

(2x + 15 )° + ( x + 20 )° + 75° = 180°

3x + 110 = 180

3x = 70

x = 70/3° = 23.3333333°

Answer 2

Answer:

sum of all angles of triangle=180°

(2x+15)°+(x+20°)+75° = 180°

2x+15+x+20+75=180°

2x+x+15+20+75=180°

3x+110=180°

3x=180°-110

3x=70

x=70÷3

x=23.34