Understanding today s lesson comes down again to using the correct formula and finding the correct values to plug into it.
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1 Lesson 25 Lesson 25, page 1 of 10 Glencoe Geometry Chapter 11.5, 11.6 Volume: Prisms, Cylinders, Pyramids, & Cones This week we look at the same solids as last time, we just add an extra dimension. Surface area is a two-dimensional quantity, while volume is a three-dimensional quantity. Understanding today s lesson comes down again to using the correct formula and finding the correct values to plug into it. Depending on your teacher, you may have to memorize some of these formulas, but most of them will be found on a formula chart.
2 Lesson 25, page 2 of 10 Volume of a Right Prism The Volume, V, of a Right Prism with a base area of B square units and a height of h units is given by V = Bh To use this formula, you must correctly identify and find the area of the base. These will vary from shape to shape, but the formula can be found on a chart. h h h B Pentagonall priism B = 1 Pa 2 B Triiangullar priism 1 * B = bh 2 *CAUTION: This h is the height of the triangle, not the height of the prism. They are different quantities in different contexts represented by the same variable!! B Hexagonall priism 1 B = Pa 2
3 Example: Lesson 25, page 3 of 10 Find the Volume of the right, triangular prism. 4 in 6 in Although the Net representation is more useful for finding Surface Area, we can also use it to find the Volume, we just must be more careful in identifying the base and height.
4 Lesson 25, page 4 of 10 Example: Find the volume of the right triangular prism given the net of the solid. Volume of a Right Cylinder The Volume, V, of a Right Cylinder with a height of h units and a radius of r units is given by V = π 2 r h Notice as before that the Volume is just the area of the base times the length of a lateral side!!!
5 Example: Lesson 25, page 5 of 10 Find the volume of the cylinder. Formulas are also called Literal Equations, since they contain multiple variables (Literal means letters ) and constants (like π ). We can use the formula to solve for ANY variable, as long as we know (or can find) all the others. This really increases the usefulness of the formulas. Here s what I mean...
6 Example: Lesson 25, page 6 of 10 Tate is constructing a cylinder that can hold 90.8 cubic centimeters. If the diameter of the cylinder is 3.4 centimeters, what should the height measure? Way to go, Tate!!
7 Lesson 25, page 7 of 10 Volume of a Right Circular Cone The Volume, V, of a Right Circular Cone with a height of h units and a base area of B square units is given by V 1 Bh 3 = or V = π 3 2 r h You can think of the cone as being one-third of the volume of the smallest cylinder containing it. Example: Find the volume of the cone.
8 Lesson 25, page 8 of 10 Volume of a Right Pyramid The Volume, V, of a Right Pyramid with a height of h units and a base area of B square units is given by V = 1 Bh 3 You can think of the pyramid as being onethird of the volume of the smallest prism containing it. Example: Find the volume of the pyramid.
9 Lesson 25, page 9 of 10 Say What?!?! contributions in many mathematical fields including geometry (he gave the first estimate for and π between Regarded as one of the three greatest mathematicians and inventors of all time was Archimedes of Syracuse (287BC 212BC). His inventions ranged from incredible war machines, the Archimedean screw, and the lever. He made lasting Archimedean Screw Wikipedia.org ) and calculus (he is known as the father of integral calculus even though he preceded Newton and Leibniz by almost 2000 years!!!).
10 Of all his remarkable discoveries, the one of which he was most proud was his discovery of the ratio of the volumes of a right cylinder and its inscribed sphere. Lesson 25, page 10 of He found that the ratio of the volumes of the cylinder to the sphere was a tidy 3:2. If fact, he was so proud of this discovery, it was placed on his tombstone!! Give me a place to stand, and I shall move the Earth. --Archimedes
Understanding today s lesson comes down again to using the correct formula and finding the correct values to plug into it.
Lesson 5 Lesson 5, page 1 of 11 Glencoe Geometry Chapter 11.5, 11.6 Volume: Prisms, Cylinders, Pyramids, & Cones This week we look at the same solids as last time, we just add an extra dimension. Surface
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