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Explore the solution for Grade 5 math problem on page 14 of VBT book 2, Practice, exercise 98. This guide provides detailed explanations for each exercise, making it easy for students to solve exercises 1, 2, 3, and understand the rules and formulas for calculating the circumference and area of circles.
Solving Grade 5 Math Problem on Page 14 of VBT Book 2, Practice, Exercise 98
1. Solve exercise 1 - Math workbook for 5th grade, exercise 2 on page 14
Problem statement:
Fill in the blanks with the appropriate measurements:
Solution method:
To calculate the circumference of a circle, double the radius and then multiply by 3.14.
Formula for circumference:
To find the area of a circle, multiply the radius by itself and then by 3.14.
Formula for area:
(Where S represents the area of the circle, and r is the radius of the circle).
Solution
Circumference of circle (1) is:
C = 20 x 2 x 3.14 = 125.6 (cm)
Area of circle (1) is:
Area of circle (2) is:
Circumference of circle (2) is:
C = 0.25 x 2 x 3.14 = 1.57 (m)
Area of circle (2) is:
Area of circle (2) is:
So, we have the result table as follows:
2. Solve problem 2 - Math workbook grade 5 volume 2 page 13
Problem:
Write appropriate measurements in the blanks:
Solution Method:
- From the formula for circumference: C = r x 2 x 3.14, we deduce the radius r = C : 3.14 : 2.
- Calculate the area of the circle using the formula: S = r x r x 3.14.
Answers
Diameter of circle (1):
d = C : 3.14 = 31.4 : 3.14 = 10cm
Radius of circle (1):
Radius of circle (1):
Area of circle (1):
S = 5 x 5 x 3.14 = 78.5cm2
Diameter of circle (2):
Diameter of circle (2):
Radius of circle (2):
r = 3 : 2 = 1.5m
Area of circle (2):
Area of shaded part:
3. Solve problem 3 - Math workbook grade 5 workbook 2 page 14
Choose the letter in front of the correct answer:
The area of the shaded part is:
Area of the shaded region in the rectangle is:
A. 6.785 cm2
B. 13.85 cm2
C. 5.215 cm2
D. 6 cm2
Solution Method:
- Shaded area = area of rectangle - area of circle with radius 0.5 dm.
- Area of rectangle = length x width.
- Area of the circle = radius x radius x 3.14.
Answer
Area of the circle is :
0.5 x 0.5 x 3.14 = 0.785 (cm2)
Area of the rectangle is :
3 x 2 = 6 (cm2)
Shaded area is :
6 - 0.785 = 5.215 (cm2)
Select option C
You are currently viewing the guide for solving Grade 5 math page 14 VBT workbook 2, Exercise 98. You can review the instructions for solving Grade 5 math page 13, 14 VBT workbook 2 Circular area or preview the guide for solving Grade 5 math page 15, 16 VBT workbook 2 Exercise to have a better understanding of the lesson.
Wishing you success in your math studies.
