Answer:
angles: 33, 33, 114
Step-by-step explanation:
An isosceles triangle has 2 angles with the same measure x
the third angle = 15+3x
the 3 angles of a triangle = 180
x+ x + 3x+15 = 180
combine like terms
5x + 15 = 180
subtract 15 from each side
5x+15-15 = 180 - 15
5x = 165
divide by 5
5x/5 = 165/5
x = 33
two angles measure 33
the third angle = 3x+15
= 3*33 + 15 = 99+15 = 114