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Mathematics

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Can someone tell me the answer to this please

Can Someone Tell Me The Answer To This Please class=

Answer :

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It’s an isosceles triangle, which means those two angles on the right are equal and since one of them is 77, the other one is 77 too.
The sum of the angles in a triangle is 180, so:
77 + 77 + x =180
154+x=180
X=180-154
X=26

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