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let the vertical angle be x
so the base angles will be x+15
by angle sum property,
x+x+15+x+15=180
=>3x+30=180
=>3x=150
=>x=50
hence the three angles of the triangle are 50,65,65
so the base angles will be x+15
by angle sum property,
x+x+15+x+15=180
=>3x+30=180
=>3x=150
=>x=50
hence the three angles of the triangle are 50,65,65
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