When 1480 is divided into 12 equal parts, the remainder is 4. What is a correct way to right the quotient?

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

Math it's appreciated. (picture provided)