# Category Archives: NCERT

Question 1. Two customers Shyam and Ekta are visiting a particular shop in the same week (Tuesday to Saturday). Each is equally likely to visit… Read More
Question 1. Evaluate : (i) sin 18° / cos 72° Solution: Since,  cos 72°  = cos ( 90° – 18° ) = sin 18° Therefore,  sin… Read More
Question 1. Determine whether each of the following relations are reflexive, symmetric and transitive: (i) Relation R in the set A={ 1, 2,3, . .… Read More
Write minors and cofactors of the elements of the following determinants:  Question 1.  (i)  (ii)  Solution:  (i)  Finding minors of the elements of the determinant: … Read More
Question 1. In Fig., PS is the bisector of ∠QPR of ΔPQR. Prove that Solution: Given: PS is angle bisector of ∠QPR. To prove:  Construction:… Read More
Question 1. Find the area of the triangle whose vertices are: (i) (2, 3), (-1, 0), (2, -4) Solution: Area = 1/2 [x1(y2 – y3)… Read More
Question 1. Find the area of a sector of a circle with radius 6 cm if angle of the sector is 60°. Solution: Given: r=66cm… Read More
Chapter 12 Areas Related to Circles – Exercise 12.2 | Set 1  Question 8. A horse is tied to a peg at one corner of… Read More
Question 1. A park, in the shape of a quadrilateral ABCD, has ∠ C = 90º, AB = 9 m, BC = 12 m, CD… Read More
Question 1. Find area of the triangle with vertices at the point given in each of the following :  (i) (1, 0), (6, 0), (4,… Read More
Question 1. A die is rolled. Let E be the event “die shows 4” and F be the event “die shows even number”. Are E… Read More
Question 1. The relation f is defined by f(x) = {x2, 0 ≤ x ≤ 3   3x, 3 ≤ x ≤ 10}  The relation… Read More
Question 1. A drinking glass is in the shape of a frustum of a cone of height 14 cm. The diameters of its two circular… Read More
Question 1. A circus artist is climbing a 20 m long rope, which is tightly stretched and tied from the top of a vertical pole… Read More
Chapter 3 Matrices – Exercise 3.4 | Set 1  Question 11.  Solution: } Question 12.  Solution: Here, both the elements of R2 of L.H.S. are… Read More