Cho hình hộp chữ nhật ABCD A'B'C'D' có cạnh AA' = a tính khoảng cách giữa mặp phẳng ABCD và A'B'C'D'

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line