Cho hình thang cân ABCD (AB//CD) có AB=4cm, CD= 10cm, AD=5cm. Trên tia đối của tia BD lấy điểm E sao cho BE=BD. Gọi H là chân đường vuông góc kẻ từ E đến DC. Tính độ dài CH.

What is the least common factor of 6 and 8

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.