Blog

Question 1.Construct ∆XYZ, such that YZ = 7.4 cm, ∠XYZ = 45° and XY – XZ = 2.7 cm.Solution: Here, XY – XZ = 2.7 cm∴ XY > XZAs shown in the rough figure draw seg YZ = 7.4 cmDraw a ray YP making an angle of 45° with YZTake a point W on ray … Read more

Question 1.Construct APQR, in which QR = 4.2 cm, m∠Q = 40° and PQ + PR = 8.5 cm.Solution: As shown in the rough figure draw seg QR = 4.2 cmDraw a ray QT making an angle of 40° with QRTake a point S on ray QT, such that QS = 8.5 cmNow, QP + … Read more

Question 1.In the adjoining figure, point A is on the bisector of ∠XYZ. If AX = 2 cm, then find AZ. Solution:AX = 2 cm [Given]Point A lies on the bisector of ∠XYZ. [Given]Point A is equidistant from the sides of ∠XYZ. [Every point on the bisector of an angle is equidistant from the sides … Read more

Question 1.Choose the correct alternative answer for the following questions. i. If two sides of a triangle are 5 cm and 1.5 cm, the length of its third side cannot be ____.(A) 3.7 cm(B) 4.1 cm(C) 3.8 cm(D) 3.4 cmAnswer:Sum of the lengths of two sides of a triangle > length of the third sideHere, … Read more

Question 1.In the adjoining figure, point A is on the bisector of ∠XYZ. If AX = 2 cm, then find AZ. Solution:AX = 2 cm [Given]Point A lies on the bisector of ∠XYZ. [Given]Point A is equidistant from the sides of ∠XYZ. [Every point on the bisector of an angle is equidistant from the sides … Read more

Question 1.Find the values of x and y using the information shown in the given figure. Find the measures of ∠ABD and ∠ACD. Solution:i. ∠ACB = 50° [Given]In ∆ABC, seg AC ≅ seg AB [Given]∴ ∠ABC ≅ ∠ACB [Isosceles triangle theorem]∴ x = 50° ii. ∠DBC = 60° [Given]In ABDC, seg BD ≅ seg DC … Read more

Question 1.In each of the examples given below, a pair of triangles is shown. Equal parts of triangles in each pair are marked with the same signs. Observe the figures and state the test by which the triangles in each pair are congruent. By SSS test∆ABC ≅ ∆PQR By SAS test∆ XYZ ≅ ∆LMN By … Read more

Question 1.In the adjoining figure, ∠ACD is an exterior angle of ∆ABC. ∠B = 40°, ∠A = 70°. Find the measure of ∠ACD. Solution:∠A = 70° , ∠B = 40° [Given]∠ACD is an exterior angle of ∆ABC. [Given]∴ ∠ACD = ∠A + ∠B= 70° + 40°∴ ∠ACD = 110° Question 2.In ∆PQR, ∠P = 70°, … Read more

Question 1.Select the correct alternative and fill in the blanks in the following statements. i. If a transversal intersects two parallel lines then the sum of interior angles on the same side of the transversal is ____.(A) 0°(B) 90°(C) 180°(D) 360°Answer:(C) 180° ii. The number of angles formed by a transversal of two lines is … Read more

Question 1.In the given figure, y = 108° and x = 71°. Are the lines m and n parallel? Justify? Solution:y = 108°, x = 71° …[Given]x + y = 71° + 108°= 179°∴ x + y = 180°∴ The angles x andy are not supplementary.∴ The angles do not satisfy the interior angles test … Read more