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Guide to solve exercise 2 on page 99 of Math 5 Workbook
Exercise:
a) Calculate the diameter of a circle with circumference C = 15.7m.
b) Calculate the radius of a circle with circumference C = 18.84dm
Solution Method:
a) Apply formula: C = d x pi => d = C : pi (To find the diameter of the circle, divide the circumference of the circle by pi)
b) Apply formula: C = r x 2 x pi => r = C : r : pi (To find the radius of the circle, divide the circumference of the circle by 2, then divide by pi)
* Note: The value of pi = 3.14.
Answer:
a) According to the problem, we have:
d x 3.14 = C
=> d x 3.14 = 15.7
=> d = 15.7 : 3.14
=> d = 5
So, the diameter of the circle is 5m.
b) According to the problem, we have:
r x 2 x 3.14 = C
=> r x 2 x 3.14 = 18.84
=> r x 6.28 = 18.84
=> r = 3
So, the radius of the circle is 3dm.
Section Math 5 Exercise Solution Page 99, Practice includes 4 exercises, Next is the solution for exercise 2 page 99 Math 5 Workbook. Mytour provides hints and detailed solution methods for Solve Exercise 1 Page 99 Math 5 Workbook,Solve Exercise 3 Page 99 Math 5 Workbook andSolve Exercise 4 Page 99 Math 5 Workbook., students need to understand the knowledge of this lesson.
