Question

please answer the question​

Answer 1

Answer:

the measure of angle BAC is 90°

Answer 2

Step-by-step explanation:

<DAC = <C[opp. angles of]

<BAD = <B[equal sides. ]

<DAC = 40°

<BAD = <B

<A+<B+<C = 180°[sum of angles of a ∆ is 180°]

<DAC+<BAD+<B+40° = 180°

40°+<B+<B+40° = 180°

2<B = 180°–80°

2<B = 100°

<B = 50°

<A = <DAC+<BAD

<A = 40°+<B

<A = 40°+50°

<A = 90°