Geometrical figures

Power point on introducing geometry and a review of known shapes.

1. Fun with Geometrical Figures

2. FINDING SHAPES: USE THE FINDING SHAPES WORKSHEET PROVIDED AND FIND SHAPES AROUND THE ROOM THAT FIT INTO EACH CATEGORY: CIRCLES TRIANGLES SQUARES RECTANGLES FIND AS MANY SHAPES AS YOU CAN IN 5 MINUTES, GO!

3. Common Shapes & characteristiscs : What are some characteristics of a circle? What about a triangle? A square and rectangle? What do we notice about the square and rectangle and their similarities?

4. Common Shapes: CIRCLE – A SET OF POINTS EQUAL DISTANCE FROM A GIVEN POINT, CALLED THE CENTER OF THE CIRCLE WITH NO ANGLES. RECTANGLE – SQUARE – TRIANGLE –

5. Common Shapes: CIRCLE – A SET OF POINTS EQUAL DISTANCE FROM A GIVEN POINT, CALLED THE CENTER OF THE CIRCLE WITH NO ANGLES. RECTANGLE – A SHAPE THAT HAS 4 POINTS AT 4 CORNERS WITH 2 SHORT SIDES OF EQUAL LENGTH THAT ARE OPPOSITE OF EACH OTHER AND 2 LONG SIDES OF EQUAL LENGTH THAT ARE OPPOSITE OF EACH OTHER. THIS SHAPE HAS 4 RIGHT ANGLES. SQUARE – TRIANGLE –

6. Common Shapes: CIRCLE – A SET OF POINTS EQUAL DISTANCE FROM A GIVEN POINT, CALLED THE CENTER OF THE CIRCLE WITH NO ANGLES. RECTANGLE – A SHAPE THAT HAS 4 POINTS AT 4 CORNERS WITH 2 SHORT SIDES OF EQUAL LENGTH THAT ARE OPPOSITE OF EACH OTHER AND 2 LONG SIDES OF EQUAL LENGTH THAT ARE OPPOSITE OF EACH OTHER. THIS SHAPE HAS 4 RIGHT ANGLES SQUARE – A RECTANGLE WITH 4 CONGRUENT SIDES AND 4 RIGHT ANGLES. TRIANGLE -

7. Common Shapes: CIRCLE – A SET OF POINTS EQUAL DISTANCE FROM A GIVEN POINT, CALLED THE CENTER OF THE CIRCLE WITH NO ANGLES. RECTANGLE – A SHAPE THAT HAS 4 POINTS AT 4 CORNERS WITH 2 SHORT SIDES OF EQUAL LENGTH THAT ARE OPPOSITE OF EACH OTHER AND 2 LONG SIDES OF EQUAL LENGTH THAT ARE OPPOSITE OF EACH OTHER. THIS SHAPE HAS 4 RIGHT ANGLES SQUARE – A RECTANGLE WITH 4 CONGRUENT SIDES AND 4 RIGHT ANGLES. TRIANGLE – A SHAPE WITH 3 SIDES AND 3 ANGLES . **Now draw each shape next to its definition**

8. TYPES OF TRIANGLES : ACUTE ANGLE – AN ANGLE LESS THAN 90 DEGREES --show me with your arms what this angle looks like? OBTUSE ANGLE – AN ANGLE GREATER THAN 90 DEGREES -- show me with your arms what this angle looks like? RIGHT TRIANGLE – A TRIANGLE WITH ONE 90 DEGREE ANGLE AND 2 ACUTE ANGLES -- show me with your arms what this angle looks like?

9. Now Let’s try to draw these! What do you notice about the sides of these different triangles? What about the shapes each triangle makes? -- Let’s Discuss!

10. SCALENE TRIANGLE – ALL 3 SIDES AND ALL 3 ANGLES ARE DIFFERENT --Try and draw this! EQUILATERAL TRIANGLE – ALL 3 ANGLES ARE THE SAME AND ALL 3 SIDES ARE CONGRUENT --Try and draw this ISOSCELES TRIANGLE – 2 ANGLES ARE THE SAME AND 2 SIDES ARE CONGRUENT --Try and draw this

11. --Can a triangle be acute and equilateral? -- Obtuse and isocleles ? -- Any combinations of these? Why or why not? Talk with a partner.