susanspagoot6385
21.11.2020 •
Mathematics
What’s the angle of x ??
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Ответ:
45 degrees
Step-by-step explanation:
Since the angle at the top is 90 degrees, two 45 degrees would equal 90
Ответ:
a = 49°
Step-by-step explanation:
OB = OC ( both radii of the circle ), thus
Δ BOC is isosceles and the base angles are congruent, that is
∠ OBC = ∠ OCB = 41° , so
∠ BOC = 180° - (2 × 41)° = 180° - 82° = 98°
The angle on the circumference BAC is half the angle at the centre for angles subtended on the same arc , thus
a = 0.5 × 98° = 49°