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Marat540 [252]
3 years ago
6

Pls help me I need help

Mathematics
1 answer:
AVprozaik [17]3 years ago
7 0

Answer:

Step-by-step explanation:

Remark

Triangle BAC is isosceles. It has 2 sides that are both radii of the circle. I assume that C is the center of the circle.

Givens

AC = BC                          Both of these are radii.

<BCD = 20o                   Given

<A and <B are equal     Both are opposite a radii of the circle

C is the circle's center  Assumed otherwise we can't do it.

Solution

<BCD is an exterior angle of Triangle ACB  It's on the same straight line as D and A

The sum of 2 remote interior angles = the sum of the exterior angle.

BAC = ABC                   Stated above

BAC + ABC = 20           Stated right above.

2BAD = 20

BAD = 20/2

BAD = 10

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