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Answer:
The Answer is 40°
Explanation:
Base angles of an isosceles triangle are equal
x+30=70
x=70-30
x=40°
so,
<C=70°
<A+<B+<C=180°
let <A be X
X+70+70=180°
X+140=180°
X=180-140
X=40°
X=2x-10
40°=2x-10
2x=40+10
2x=50°
divide both sides by 2
x=25°
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