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Worksheet Solution: Mensuration | Mental Mathematics for Class 8 PDF Download

Q1. What is the perimeter of a regular triangle if one side is 5 cm long?
Ans: 
15 cm

Q2. Is a regular triangle right, obtuse, or acute?
Ans: 
Acute

Q3. How many mm are in 15.3 cm?
Ans: 
153 mm

Q4. Two short sides of a right triangle are 3 and 4 units. How long is the hypotenuse?
Ans: 
5 units

Q5. Two short sides of a right triangle are 6 and 8 units. How long is the hypotenuse?
Ans: 
10 units

Q6. What is a formula to find the area of a circle?
Ans: 
A = πr2 or
A = π x r x r

Q7. What is the approximate value of pi to two decimal places?
Ans: 
3.14

Q8. What will the ratio of the circumference of a circle to its diameter always be equal to?
Ans:
π

Q9. A kite is 80 cm tall and 60 cm across. All of its sides are equal. What is its perimeter?
Ans:
200 cm

Q10. The length of a hypotenuse of a right triangle is √5 cm. How long might the sides be?
Ans:
2 cm and 1 cm

Q11. What is the name of a regular rectangle?
Ans: 
Square

Q12. Is a regular triangle isosceles, equilateral, or scalene?
Ans: 
Equilateral

Q13. How many mm are in 205.64 cm?
Ans:
2056.4 mm

Q14. If the lengths of the sides of the above triangle are all doubled, what happens to the measurements of the angles?
Ans: 
They remain the same.

Q15. The hypotenuse of a right triangle is 15 cm long, and one of the sides is 9 cm. How long is the missing side?
Ans: 
12 cm

Q16. A circle has a diameter of 10 cm. What is the radius?
Ans: 
5 cm

Q17. If you add the interior angles of any triangle, how many degrees will there be?
Ans: 
180°

Q18. If you add the interior angles of any rectangle, how many degrees will there be?
Ans: 
360°

Q19. Find the perimeter.
Worksheet Solution: Mensuration | Mental Mathematics for Class 8Ans: 
24 m

Q20. Find the diagonal.
Worksheet Solution: Mensuration | Mental Mathematics for Class 8Ans:
1 m

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