Question

in the diagram, ∠dab and ∠dac are adjacent angles. if m∠dac = 25°, what is m∠dab in degrees? m∠bac in degrees? 90 80 45 40

Explanation:

Step1: Set $\angle DAC=x - 20=25$.

Solve for $x$: $x=45$.

Step2: Find $\angle DAB$.

$\angle DAB=2x - 10=2\times45- 10=80$.

Answer:

$80$