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Mathematics 20 Online
OpenStudy (anonymous):

...

OpenStudy (shayaan_mustafa):

it is B madam.

Directrix (directrix):

a) Angle Addition Postulate states that if a point S lies in the interior of ∠PQR, then m∠PQS + m∠SQR = m∠PQR. d) Subtraction Property of Equality (subtracting 10 from each side of equation) So, B) Angle Addition Postulate; Subtraction Property of Equality

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