A Regular Polygon Carmelo Ellul Head of Department (Mathematics)

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Presentation transcript:

A Regular Polygon Carmelo Ellul Head of Department (Mathematics) A powerpoint presentation by Carmelo Ellul Head of Department (Mathematics)

360º ÷ 5 = 72º A Regular Polygon Task: Inscribe a regular pentagon in a circle of radius 3 cm. 1 2 3 4 5 6 7 8 9 cm B Draw any radius OA. A pentagon has 5 sides. Therefore divide 360º (the angle at centre) by 5. Draw a circle of radius 3 cm. Repeat drawing angles of 72º on each new line (radius) drawn; OB, OC, OD and OE . With your protractor draw an angle of 72º on the radius OA. C O A D 360º ÷ 5 = 72º E

360º ÷ 5 = 72º A Regular Polygon Task: RESTART END SHOW Task: Inscribe a regular pentagon in a circle of radius 3 cm. A B C O D E Join AB, BC, CD, DE and EA. ABCDE is the required pentagon. 360º ÷ 5 = 72º