Geometry Unit: Chapter 8 Quiz Review Lessons 1-4

Quiz Will be provided with all formulas needed Must write formula first, plug in numbers and show your work to get full credit for each problem Make sure you have a calculator!

8-1 Circumference = the distance around a circle – Diameter = the distance across a circle through its center – Radius = the distance from the center to any point on the circle If you have the diameter, divide it by 2 to get the radius If you have the radius, multiply it by 2 to get the diameter

8-1 Circumference Formulas (write in notebook): – C = πd OR C = 2πr Use first formula if given the diameter in the problem Use second formula if given the radius in the problem – Label answer! Regular units (in, cm, m, etc.)

8-1 Find the circumference of each circle. Use 3.14 for π. Round to the nearest tenth if necessary. 1.)2.)

8-2

Find the area of each circle. Use 3.14 for π. Round to the nearest tenth if necessary. 1.)2.)

8-2 Tarie is cutting material in the shape of semicircles for her craft project. What is the area of the semicircle? Use 3.14 for π.

8-3 Area of Composite Figures—divide figure into shapes you can find the area of – FOLLOW STEPS! (on pg. 632) 1.) Write out what shapes you are finding the area of 2.) Show work for each shape (use arrows) 3.) Add areas together 4.) Label answer (square units)

8-3 Find the area of each figure. Round to the nearest tenth if necessary. (use formulas on pg. 632 if needed) 1.) 2.)

8-3 Find the area of a shaded region: – Find the area of whole figure and subtract non- shaded parts – Show work like composite figures!

Find the area of the shaded region. Round to the nearest tenth if necessary. – Units = centimeters

8-4 Volume of Prisms—the measure of space a three- dimensional figure occupies – Cubic units (cm 3, m 3, etc.) Rectangular prism—bases are rectangles – “make base bottom face” Triangular prism—bases are triangles – use one of the triangles for calculating the area of the base

8-4 Formula: V = Bh (write in notebook) – B = area of the base – h = height of the prism (connects the bases)

8-4 Find the volume of each prism. Round to the nearest tenth if necessary. 1.)2.)