# 2D Applications of Pythagoras - Part 1 Slideshow 41, Mathematics Mr. Richard Sasaki, Room 307

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• Slide 1
• 2D Applications of Pythagoras - Part 1 Slideshow 41, Mathematics Mr. Richard Sasaki, Room 307
• Slide 2
• ObjectivesObjectives Review polygon properties and interior angles Review circle properties Be able to apply the Pythagorean Theorem to other polygons, circles and graphs
• Slide 3
• Pythagorean Theorem We know how to find missing edges of triangles now. Lets apply this to other polygons. Oh wait, what is a polygon? A polygon is a 2D shape with straight edges only. We actually already did this, this is a review. Example Find the unknown value on the polygon below.
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• Answers (Question 2) We know an interior angles in a hexagon add up to.
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• Answers (Question 3) We know an interior angles in an octagon add up to. We have a 45-45-90 triangle.
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• CirclesCircles Lets review some parts of the circle. Question types with circles are simple, but its important that we understand the vocabulary.
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• CirclesCircles Example Consider a circle with radius 6 cm. The circle has a chord 8 cm long. Find the distance between the centre and the chord. Note: It doesnt matter where the chord is, as it is a fixed length, it is always the same distance from the centre. So it may as well touch the radius.
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• GraphsGraphs Distances between points can be calculated, based on their coordinates. Note: The shortest distance between two points is always the of a triangle. hypotenuse Example We should visualize the triangle like or Lets find the hypotenuse.
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• FormulaeFormulae One of these will be provided in the exam, however you know how to do the questions without them anyway! Please bring a ruler, pencil and compass to the next lesson.

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