Question

abcd forms a square. all squares have 90° corners. m∠bac + m∠adb + m∠adc =
options: 135°, 100°, 180°

Explanation:

Step1: Identify each angle's measure

$m\angle BAC = 45^\circ$, $m\angle ADB = 45^\circ$, $m\angle ADC = 90^\circ$

Step2: Sum the three angles

$45^\circ + 45^\circ + 90^\circ$

Step3: Calculate the total

$45 + 45 + 90 = 180$

Answer:

$180^\circ$