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I need help with #12 please help me

I need help with #12 please help me-example-1

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The answer is A.
A is an isosceles triangle, with 3 acute angles and 2 equal sides. The only line of symmetry is down the middle.
B is an equilateral triangle, with 3 acute angles and 3 equal sides. There are also 3 line of symmetry: down the middle, and two lines forming a cross from the bottom two angles, so therefore, the other answer is incorrect.
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