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1 30°-60°-90° TRIANGLE 45°-45°-90° TRIANGLE PROBLEM 1 PROBLEM 2 PROBLEM 4 PROBLEM 5 Standard 20 END SHOW PRESENTATION CREATED BY SIMON PEREZ. All rights reserved PROBLEM 6 PROBLEM 3

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2 Standard 20: Students know and are able to use angle and side relationships in problems with special right triangles, given an angle and a lenght of a side. Los estudiantes saben y son capaces de usar relaciones de lado y ángulo en problemas con triángulos especiales, dado un ángulo y la longitud de su lado. PRESENTATION CREATED BY SIMON PEREZ. All rights reserved

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3 2 2 2 60° 30° 2 2 1 1 Standard 20 1. An equilateral triangle is also equiangular, all angles are the same. 2. Let’s draw an Altitude from one of the vertices. Which is also a Median and Angle bisector. 3. The bisected side is divided into two equal segments and the bisected angle has now two 30° equal angles. How is the right angle that was formed? Click to find out

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4 60° 30° 1 2 2 1 60° 30° 1 2 z 2 = z + 1 2 2 2 4 = z + 1 2 3 = z 2 2 z = 3 Standard 20 4. The triangle is divided into 2 right angles with acute angles of 30° and 60° 5. Let’s draw the top triangle and label the unknown side as z. 6. Let’s apply the Pythagorean Theorem to find the unknown side. Can we generalize this result for all 30°-60°-90° right triangles? Click to find out…

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5 60° 30° 1 2 3 (.5) (2) (s) 1 2 3 60° 30° 1 2 3 60° 30° 1 2 3 60° 30° Standard 20 7. Is this true for a triangle that is twice as big? 8. Is this true for a triangle that is half the original size? 9. What about a triangle that is “s” times bigger or Smaller? Click to find out…

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6 2 3s s s 60° 30° 3 In a 30°-60°-90° triangle, the hypotenuse is twice as long as the shorter leg, and the longer leg is times as long as the shorter leg. THEOREM 8-7 Standard 20 PRESENTATION CREATED BY SIMON PEREZ. All rights reserved

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7 Find the values of the variables. Round your answers to the nearest hundredth. x y 30° 50 90°-30°=60° 60° 2 3s s s 30° 2x = 50 2 2 x =25 y = x3 y = 25 3 OR Standard 20 Is this 30°-60°-90°? Then we know that: y = 43.30 PRESENTATION CREATED BY SIMON PEREZ. All rights reserved

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8 60° 30° 90°-60°=30° x y 90 90 = x3 3 33 90 3 = x 3 3. 3 90 3 ( ) 2 3 90 3 = x 3 30 = x OR 2x = y 3 30 ( ) = y 2 3 60 y=3 60 OR 3 30 x= Find the values of the variables. Round your answers to the nearest unit. Standard 20 Is this a 30°-60°-90°? y =104 x = 52 PRESENTATION CREATED BY SIMON PEREZ. All rights reserved 2 3s s s 60° 30°

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9 60° 30° 90°-60°=30° x y 30 30 = x3 3 33 30 3 = x 3 3. 3 30 3 ( ) 2 3 30 3 = x 3 10 = x 2x = y 3 10 ( ) = y 2 3 20 y=3 20 3 10 x= Find the values of the variables. Find the exact answer. Standard 20 Is this a 30°-60°-90°? PRESENTATION CREATED BY SIMON PEREZ. All rights reserved 2 3s s s 60° 30°

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10 1 1 1 1 Standard 20 1. Let’s draw a diagonal for the square above. The diagonal bisects the right angles of the square. What kind of right triangles are form? Click to find out… PRESENTATION CREATED BY SIMON PEREZ. All rights reserved

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11 1 1 1 1 45° 1 1 y y = 1 + 1 222 2 y = 2 2 2 Standard 20 2. The triangles are 45°-45°-90° 3. Let’s draw the bottom triangle and label the hypotenuse as y 4. Let’s apply the Pythagorean Theorem to find the hypotenuse. Can we generalize our findings? Click to find out…

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12 45° 1 1 2 (.5) (1.5) s s s 1 1 2 45° 1 1 2 Standard 20 5. Let’s draw a triangle half the size of the original. 6. Let’s draw a triangle one and a half the size of the original. 7. Let’s draw a triangle S times the size of the original. Click to see our findings…

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13 s s s2 In a 45°-45°-90° triangle, the hypotenuse is times as long as a leg. THEOREM 8-6 2 45° Standard 20 PRESENTATION CREATED BY SIMON PEREZ. All rights reserved

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14 45° 90°-45°=45° 45° x y 36 If y = x 36 = x2 2 22 36 2 = x 2 2. 2 36 2 ( ) 2 2 36 2 = x 2 18 = x 2 18 x = OR 2 18 y = OR then Find the values of the variables. Round your answers to the nearest tenth. s s s2 45° Standard 20 Is this a 45°-45°-90°? x = 25.5 y = 25.5

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15 45° 90°-45°=45° 45° x y 42 If y = x 42 = x2 2 22 42 2 = x 2 2. 2 42 2 ( ) 2 2 42 2 = x 2 21 = x 2 21 x = 2 21 y =then Find the values of the variables. Give an exact answer. s s s2 45° Standard 20 Is this a 45°-45°-90°?

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16 45° 90°-45°=45° x 21 y 45° x = 21 2 x y= 2 21 y = Find the values of the variables. Give the exact answer. Standard 20 Is this a 45°-45°-90°? PRESENTATION CREATED BY SIMON PEREZ. All rights reserved s s s2 45°

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