Awooden board is 3 yards and 1 foot long what is a equivalent length

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)