Find $m\angle ABC$ Three rays B A, B D, and ray B C start from a common point B. The measure of the angle formed by ray B A and ray B D is 37 degrees. The measure of the angle formed by ray B D and ray B C, is 21 degrees.

(! ) three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder

He ! a group of farmers planned to clean 80 acres of wheat per day to finish the work on schedule. right before the work started, they received a new piece of machinery that them clean 10 more acres per day than originally planned. as a result of increased productivity in the last day before the deadline they only had to clean 30 acres. how many acres of wheat did the group of farmers have to clean?

Plz ( true - false) all triangles have interior angles whose measure sum to 90.