I'm stupid and I don't know how to find this out

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

Is a pencil falling to the floor anon contact force, a force, or a contact force