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38. The diagram below shows the 1, 2, 3 and 4" trianguler numbers. 00 000 00 000 o0 10 nin+ 1) The formula can be used to find the w triangular number. For example the 5th triangular number is 5(5 + 1)-5x6 = 15 2 How many of the triangular numbers that are less than 2000 are odd?

38. The diagram below shows the 1, 2, 3 and 4" trianguler numbers. 00 000 00 000 o0 10 nin+ 1) The formula can be used to find the w triangular number. For example the 5th triangular number is 5(5 + 1)-5x6 = 15 2 How many of the triangular numbers that are less than 2000 are odd?

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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38. The dlagram below shows the 1, 2, 3 and 4 triangular numbers. 40. Lin started walking from Point X. She stopped when she first reached the sundial. KEY Sundial 3 10 The formula nin+ 1) can be used to 2. find the h triangular number. At all times, Lin kept her left hand on the wall to her left and turmed only when she reached a corner. For example the 5th triangular number is 5(5+1)5x6- 15 2 How many of the triangular numbers that are less than 2000 are odd? What was the total size of the angle through which Lin turned to reach the sundial? 39. Aline of symmetry divides a 2D shape Into two mimor images. For example, a rectangle has two lines of symmetry. A plane of aymmetry divides a 3D shape into two miror images. How many planes of symmetry does a cube have?
Transcribed Image Text:38. The dlagram below shows the 1, 2, 3 and 4 triangular numbers. 40. Lin started walking from Point X. She stopped when she first reached the sundial. KEY Sundial 3 10 The formula nin+ 1) can be used to 2. find the h triangular number. At all times, Lin kept her left hand on the wall to her left and turmed only when she reached a corner. For example the 5th triangular number is 5(5+1)5x6- 15 2 How many of the triangular numbers that are less than 2000 are odd? What was the total size of the angle through which Lin turned to reach the sundial? 39. Aline of symmetry divides a 2D shape Into two mimor images. For example, a rectangle has two lines of symmetry. A plane of aymmetry divides a 3D shape into two miror images. How many planes of symmetry does a cube have?
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