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Over [174]
3 years ago
13

BCD is a straight line.

Mathematics
1 answer:
Ksenya-84 [330]3 years ago
8 0
It’s an isosceles triangle because angle A is equal to angle C (63deg). This is calculated by 180 - 117 = 63 degrees.
Using the exterior angle is equal to the interior angles property, angle A is equal to 117 - 54 (which is 63).
Because these two angles are equal to eachother, the triangle is isosceles.
Hope this helps and please mark me brainliest
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