Discussion
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- Question
An error of 2% in excess is made while measuring the side of a square. The percentage of error in the calculated area of the square is
Options- A. 4.04%
- B. 5.04%
- C. 6.04%
- D. 7.04%
- Correct Answer
- 4.04%
Explanation100 cm is read as 102 cm
a = 100 x 100 sq.cm and b = 102 x 102 sq.cm
then, Increase in area = [ (102 x 102) - (100 x 100) ] sq.cm
percentage error = = 4.04%
- 1. A square and rectangle have equal areas. If their perimeters are p and q respectively. Then
Options- A. p
- B. p>q
- C. p=q
- D. none of these Discuss
- 2. Find the length of the altitude of an equilateral triangle of side 33 cm.
Options- A. 4.5
- B. 3.5
- C. 2.5
- D. 6.5 Discuss
- 3. A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 680 sq. feet, how many feet of fencing will be required?
Options- A. 22
- B. 44
- C. 66
- D. 88 Discuss
- 4. A towel, when bleached, was found to have lost 20% of its length and 10% of its breadth. The percentage of decrease in area is:
Options- A. 18%
- B. 28%
- C. 38%
- D. 48% Discuss
- 5. In ?ABC, AC = BC and ?ABC = 50°, the side BC is produced to D so that BC = CD then the value of ?BAD is
Options- A. 80°
- B. 40°
- C. 90°
- D. 50° Discuss
- 6. A slice from a circular pizza of diameter 14 inches is cut in asuch a way that each slice of pizza has a central angle of 45°. What is the area of each slice of Pizza(in square inches)?
Options- A. 16.25
- B. 19.25
- C. 18.25
- D. 17.25 Discuss
- 7. The length of the radius of the circumference of a triangle having sides 9 cm, 12 cm and 15 cm is
Options- A. 6 cm
- B. 7.5 cm
- C. 4.5 cm
- D. 8 cm Discuss
- 8. From a square plate with each side 7 cm, squares of area 0.25 sq. cm are cut out at each corner and the remaining plate is folded along the cuts to form a cuboid. The volume of this open-top cuboid will be ......... . cub.cm
Options- A. 21
- B. 16
- C. 18
- D. 20 Discuss
- 9. A quadrilateral is inscribed in a circle. If the opposite angles of the quadrilateral are equal and length of its adjacent sides are 6 cm and 8 cm, what is the area of the circle?
Options- A. 64? sq cm
- B. 25? sq cm
- C. 36? sq cm
- D. 49? sq cm Discuss
- 10. Points P and Q lie on side AB and AC of triangle ABC respectively such that segment PQ is parallel to side BC. If the ratio of AP:PB is 2:3, and area of ? APQ is 8 sq cm, what is the area of trapezium PQCB?
Options- A. 50 sq cm
- B. 18 sq cm
- C. 42 sq cm
- D. 14 sq cm Discuss
Area problems
Search Results
Correct Answer: p
Explanation:
square and a rectangle with equal areas will satisfy the
relation p < q
Correct Answer: 4.5
Explanation:
Let the length of the altitude be h.
Then, h =
=
= 4.5
Correct Answer: 88
Explanation:
We have: l = 20 ft and lb = 680 sq. ft.So, b = 34 ft.
Length of fencing = (l + 2b) = (20 + 68) ft = 88 ft.
Correct Answer: 28%
Explanation:
Let original length = x and original breadth = y.
Decrease in area = xy - = (7/25)xy
Decrease % = (7/25)xy * (1/xy) * 100 = 28%
Correct Answer: 90°
Correct Answer: 19.25
Correct Answer: 7.5 cm
Correct Answer: 18
Correct Answer: 25? sq cm
Correct Answer: 42 sq cm
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