NCERT Class 9
If a, b, c are the lengths of three sides of a triangle, then area of a triangle = root s(s – a) (s – b) (s – c) , where s = perimeter of triangle.
02
Jul
If a, b, c are the lengths of three sides of a triangle, then area of a triangle = root s(s – a) (s – b) (s – c) , where s = perimeter of triangle. B c are the lengths of three sides of a triangle If A then area of a triangle = [...]
The base of a right triangle is 8 cm and hypotenuse is 10 cm. Its area will be
02
Jul
The base of a right triangle is 8 cm and hypotenuse is 10 cm. Its area will be The base of a right triangle is 8 cm and hypotenuse is 10 cm. Its area will be July 2, 2021 Category: Chapter 12 - Heron's Formula , Maths , NCERT Class 9 ,
8. A design is made on a rectangular tile of dimensions 50 cm × 70 cm as shown in Fig. 12.7. The design shows 8 triangles, each of sides 26 cm, 17 cm and 25 cm. Find the total area of the design and the remaining area of the tile.
02
Jul
8. A design is made on a rectangular tile of dimensions 50 cm × 70 cm as shown in Fig. 12.7. The design shows 8 triangles, each of sides 26 cm, 17 cm and 25 cm. Find the total area of the design and the remaining area of the tile. 17 cm and 25 cm. [...]
7. The dimensions of a rectangle ABCD are 51 cm × 25 cm. A trapezium PQCD with its parallel sides QC and PD in the ratio 9 : 8, is cut off from the rectangle as shown in the Fig. 12.6. If the area of the trapezium PQCD is 5/6 th part of the area of the rectangle, find the lengths QC and PD.
02
Jul
7. The dimensions of a rectangle ABCD are 51 cm × 25 cm. A trapezium PQCD with its parallel sides QC and PD in the ratio 9 : 8, is cut off from the rectangle as shown in the Fig. 12.6. If the area of the trapezium PQCD is 5/6 th part of the area [...]
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7. The dimensions of a rectangle ABCD are 51 cm × 25 cm. A trapezium PQCD with its parallel sides QC and PD in the ratio 9 : 8 ,
find the lengths QC and PD. ,
is cut off from the rectangle as shown in the Fig. 12.6. If the area of the trapezium PQCD is 5/6 th part of the area of the rectangle ,
6. In Fig. 12.5, ∆ ABC has sides AB = 7.5 cm, AC = 6.5 cm and BC = 7 cm. On base BC a parallelogram DBCE of same area as that of ∆ ABC is constructed. Find the height DF of the parallelogram.
02
Jul
6. In Fig. 12.5, ∆ ABC has sides AB = 7.5 cm, AC = 6.5 cm and BC = 7 cm. On base BC a parallelogram DBCE of same area as that of ∆ ABC is constructed. Find the height DF of the parallelogram. ∆ ABC has sides AB = 7.5 cm 6. In Fig. [...]
5. A field is in the shape of a trapezium having parallel sides 90 m and 30 m. These sides meet the third side at right angles. The length of the fourth side is 100 m. If it costs Rs 4 to plough 1m^2 of the field, find the total cost of ploughing the field.
02
Jul
5. A field is in the shape of a trapezium having parallel sides 90 m and 30 m. These sides meet the third side at right angles. The length of the fourth side is 100 m. If it costs Rs 4 to plough 1m^2 of the field, find the total cost of ploughing the field. [...]
4. A rectangular plot is given for constructing a house, having a measurement of 40 m long and 15 m in the front. According to the laws, a minimum of 3 m, wide space should be left in the front and back each and 2 m wide space on each of other sides. Find the largest area where house can be constructed.
02
Jul
4. A rectangular plot is given for constructing a house, having a measurement of 40 m long and 15 m in the front. According to the laws, a minimum of 3 m, wide space should be left in the front and back each and 2 m wide space on each of other sides. Find the [...]
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4. A rectangular plot is given for constructing a house ,
a minimum of 3 m ,
having a measurement of 40 m long and 15 m in the front. According to the laws ,
wide space should be left in the front and back each and 2 m wide space on each of other sides. Find the largest area where house can be constructed. ,
3. The area of a trapezium is 475 cm^2 and the height is 19 cm. Find the lengths of its two parallel sides if one side is 4 cm greater than the other.
02
Jul
3. The area of a trapezium is 475 cm^2 and the height is 19 cm. Find the lengths of its two parallel sides if one side is 4 cm greater than the other. 3. The area of a trapezium is 475 cm^2 and the height is 19 cm. Find the lengths of its two parallel [...]
2. The perimeter of a triangle is 50 cm. One side of a triangle is 4 cm longer than the smaller side and the third side is 6 cm less than twice the smaller side. Find the area of the triangle.
02
Jul
2. The perimeter of a triangle is 50 cm. One side of a triangle is 4 cm longer than the smaller side and the third side is 6 cm less than twice the smaller side. Find the area of the triangle. 2. The perimeter of a triangle is 50 cm. One side of a triangle [...]
1. How much paper of each shade is needed to make a kite given in Fig. 12.4, in which ABCD is a square with diagonal 44 cm
02
Jul
1. How much paper of each shade is needed to make a kite given in Fig. 12.4, in which ABCD is a square with diagonal 44 cm 1. How much paper of each shade is needed to make a kite given in Fig. 12.4 in which ABCD is a square with diagonal 44 cm July [...]