Cho hình lăng trụ tam giác đều ABC. A’B’C’ có chiều cao bằng a và 2 đường thẳng AB’, BC’ vuông góc với nhau. Tính thể tích khối lăng trụ và diện tích xung quanh của nó.

Is the orthocenter of a triangle on the inside ?

Determine whether the graphs of y=8x+5 and -y=8x-5 are parallel, perpendicular, coincident, or none of these. a. coincident b. parallel c. perpendicular d. none of these

Abaker makes 186 cookies. some are chocolate chip and some are oatmeal raisin, and both kinds are made with and without nuts, as shown in the table above. because they are more popular, the baker made 2/3 of the cookies chocolate chip. if a chocolate chip cookie is chosen at random, what is the probability that it will have nuts? a) 21/93 b) 21/62 c) 41/93 d) 21/41