NCERT Class 9
5. Sides of a triangle are in the ratio of 12 : 17 : 25 and its perimeter is 540 cm. Find its area.
17
Oct
5. Sides of a triangle are in the ratio of 12 : 17 : 25 and its perimeter is 540 cm. Find its area. 5. Sides of a triangle are in the ratio of 12 : 17 : 25 and its perimeter is 540 cm. Find its area. October 17, 2020 Category: Chapter 12 - [...]
4. Find the area of a triangle two sides of which are 18 cm and 10 cm and the perimeter is 42cm.
17
Oct
4. Find the area of a triangle two sides of which are 18 cm and 10 cm and the perimeter is 42cm. 4. Find the area of a triangle two sides of which are 18 cm and 10 cm and the perimeter is 42cm. October 17, 2020 Category: Chapter 12 - Heron's Formula , Maths [...]
3. There is a slide in a park. One of its side walls has been painted in some colour with a message “KEEP THE PARK GREEN AND CLEAN” (see Fig. 12.10 ). If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour.
17
Oct
3. There is a slide in a park. One of its side walls has been painted in some colour with a message “KEEP THE PARK GREEN AND CLEAN” (see Fig. 12.10 ). If the sides of the wall are 15 m, 11 m and 6 m, find the area painted in colour. 11 m and [...]
2. The triangular side walls of a flyover have been used for advertisements. The sides of the walls are 122 m, 22 m and 120 m (see Fig. 12.9). The advertisements yield an earning of ₹5000 per m^2 per year. A company hired one of its walls for 3 months. How much rent did it pay?
17
Oct
2. The triangular side walls of a flyover have been used for advertisements. The sides of the walls are 122 m, 22 m and 120 m (see Fig. 12.9). The advertisements yield an earning of ₹5000 per m^2 per year. A company hired one of its walls for 3 months. How much rent did it [...]
1. A traffic signal board, indicating ‘SCHOOL AHEAD’, is an equilateral triangle with side ‘a’. Find the area of the signal board, using Heron’s formula. If its perimeter is 180 cm, what will be the area of the signal board?
17
Oct
1. A traffic signal board, indicating ‘SCHOOL AHEAD’, is an equilateral triangle with side ‘a’. Find the area of the signal board, using Heron’s formula. If its perimeter is 180 cm, what will be the area of the signal board? 1. A traffic signal board indicating ‘SCHOOL AHEAD’ is an equilateral triangle with side ‘a’. [...]
Example 6 : Prove that the quadrilateral formed (if possible) by the internal angle bisectors of any quadrilateral is cyclic.
15
Oct
Example 6 : Prove that the quadrilateral formed (if possible) by the internal angle bisectors of any quadrilateral is cyclic. Example 6 : Prove that the quadrilateral formed (if possible) by the internal angle bisectors of any quadrilateral is cyclic. October 15, 2020 Category: Chapter 10 - Circles , Maths , NCERT Class 9 ,
Example 5 : Two circles intersect at two points A and B. AD and AC are diameters to the two circles (see fig.). Prove that B lies on the line segment DC.
15
Oct
Example 5 : Two circles intersect at two points A and B. AD and AC are diameters to the two circles (see fig.). Prove that B lies on the line segment DC. Example 5 : Two circles intersect at two points A and B. AD and AC are diameters to the two circles (see fig.). [...]
Example 4 : In Fig 10.33, ABCD is a cyclic quadrilateral in which AC and BD are its diagonals. If ∠DBC = 55 degree and ∠BAC = 45 degree, find angle BCD.
15
Oct
Example 4 : In Fig 10.33, ABCD is a cyclic quadrilateral in which AC and BD are its diagonals. If ∠DBC = 55 degree and ∠BAC = 45 degree, find angle BCD. ABCD is a cyclic quadrilateral in which AC and BD are its diagonals. If ∠DBC = 55 degree and ∠BAC = 45 degree [...]
Example 3 : In figure, AB is a diameter of the circle, CD is a chord equal to the radius of the circle. AC and BD when extended intersect at a point E. Prove that ∠AEB = 60^∘
15
Oct
Example 3 : In figure, AB is a diameter of the circle, CD is a chord equal to the radius of the circle. AC and BD when extended intersect at a point E. Prove that ∠AEB = 60^∘ AB is a diameter of the circle CD is a chord equal to the radius of the [...]
Example 2 : If two intersecting chords of a circle make equal angles with the diameter passing through their point of intersection, prove that the chords are equal.
15
Oct
Example 2 : If two intersecting chords of a circle make equal angles with the diameter passing through their point of intersection, prove that the chords are equal. Example 2 : If two intersecting chords of a circle make equal angles with the diameter passing through their point of intersection prove that the chords are [...]