Presentation on theme: "1-7 Three Dimensional Figures"— Presentation transcript:
1 1-7 Three Dimensional Figures Objectives:The student will be able to:Identify and name three-dimensional figures.Find surface area and volume.
2 SolidsPolyhedron – a solid with all flat surfaces that enclose a single region of space.A few things to know about Polyhedrons:1. Each flat surface, or face, is a polygon.2. The line segments where the faces intersect are called edges.3. The point where three or more edges meet is called a vertex.
3 They can be classified as prisms or pyramids. A prism has two congruent faces called bases connected by Parallelogram faces.A pyramid has a polygonal base and three or more triangular faces that meet at a common vertex.
5 Cylinder – parallel circular bases connected by a curved surface. Cone – a circular base connected by a curved surface to a single vertex.Sphere – a set of points in a space that are the same distance from a given point.
6 Identify each solid and their base(s) Identify each solid and their base(s). If it is a polyhedron, name the faces, edges, and vertices.Triangular PrismCylinderSquare pyramid
7 Surface AreaSurface area – the sum of the areas of each face of a solid.A rectangular prism is made up of 6 rectangular (A = lw) faces. The total surface area (T) is the sum of the area of each face:T = 2(top & bottom) + 2(front & back) + 2(left & right)T = 2(lw) + 2(lw) + 2(lw)T = 2(5)(2)+2(5)(6) +2(2)(6)T = 20 in in in2T = 104 in2
8 A pyramid is made up triangles (A = ½bh) and a base (Area of a base). The total surface area (T) is the sum of the area of each face plus the Area of the base.How many sides are there?4What shape is the base?square(s2)T = 4(½bh)+ s2T = 4(½)(24)(13)+ 242T = 624 cm2+ 576 cm2T = 1200 cm2
9 Cylinder – a parallelogram and two circles. The total surface area (T) is the height (H) of the cylinder times the circumference (pd) of the cylinder plus two times the area of the base (pr2).T = Hpd + 2pr2T = 6(p4) + 2p22T = 75.4 ft ft2T = ft2
10 Volume Volume - the measure of the amount of space the solid encloses. Volume of a prism is the height (h) of the prism times the area of the base (B) :V = hBV = 6(2)(5)V = 60 in3Volume of a pyramid is ⅓ the height (H) of the pyramid times the area of the base (B) :What shape is the base?square(s2)V = ⅓Hs2V = ⅓(5)(242)V = ⅓(5cm)(576 cm2)V = ⅓(5cm)(576 cm2)V = 960 cm3
11 Volume (V) of a cylinder is the Height (H) times the Area of the base (A = pr2). V = Hpr2V = 6 ft(p)(2 ft)2V = 24p ft3V = 75.4 ft3