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Unit 12 : Geometry Friendly Notes Flat and Curved Surfaces Objects come in different shapes and sizes. They can have flat or curved surfaces. Objects with flat surfaces Objects with Objects with flat and curved curved surfaces surfaces 161 © 2014 Marshall Cavendish Education Pte Ltd 14_(M)PMCCEdn_EP2_12.indd 161 Primary Mathematics (Common Core Edition) Extra Practice 2 5/10/14 2:21 AM These objects have flat and curved faces too. vertex This solid has 6 flat faces, 8 vertices, and 12 edges. edge vertex This solid has 5 flat faces, 6 vertices, and 9 edges. edge vertex This solid has 5 flat faces, 5 vertices, and 8 edges. edge vertex This solid has 4 flat faces, 4 vertices, and 6 edges. edge 162 Primary Mathematics (Common Core Edition) Extra Practice 2 14_(M)PMCCEdn_EP2_12.indd 162 © 2014 Marshall Cavendish Education Pte Ltd 5/10/14 2:21 AM vertex This solid has 6 flat faces, 8 vertices and 12 edges. edge This solid has 1 curved face and 2 flat faces. This solid has 1 flat face, 1 curved face, and 1 vertex. vertex This solid has 1 curved face. It has no vertices and no edges. 163 © 2014 Marshall Cavendish Education Pte Ltd 14_(M)PMCCEdn_EP2_12.indd 163 Primary Mathematics (Common Core Edition) Extra Practice 2 5/10/14 2:21 AM Composite Figures We can put shapes such as squares, triangles, rectangles, and circles together to form other shapes. We can make the shape below with a triangle and a half circle. The shape is made up of 3 straight lines and a curve. We can make the shape below using 2 triangles, 2 rectangles, and a square. This is a regular pattern of shapes. What shape comes next? ? The next shape is . 164 Primary Mathematics (Common Core Edition) Extra Practice 2 14_(M)PMCCEdn_EP2_12.indd 164 © 2014 Marshall Cavendish Education Pte Ltd 5/20/14 12:46 PM Some squares are fitted together to form a rectangle. This rectangle is made up of 20 squares. This rectangle is made up of 6 squares. Angles and Shapes Any two sides joined makes an angle. A triangle has 3 sides and 3 angles. A quadrilateral has 4 sides and 4 angles. A pentagon has 5 sides and 5 angles. 165 © 2014 Marshall Cavendish Education Pte Ltd 14_(M)PMCCEdn_EP2_12.indd 165 Primary Mathematics (Common Core Edition) Extra Practice 2 5/10/14 2:21 AM A polygon is a closed figure with straight sides. A hexagon has 6 sides and 6 angles. An octagon has 8 sides and 8 angles. 166 Primary Mathematics (Common Core Edition) Extra Practice 2 14_(M)PMCCEdn_EP2_12.indd 166 © 2014 Marshall Cavendish Education Pte Ltd 5/10/14 2:21 AM
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