In a group of 80 children there are 3 times as many boys as girls how many girls are there

Classify the following triangle check all that apply

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap

What is the area of the shaded sector?